System segmentationThe current GPS consists of three major segments. These are the space segment (SS), a control segment (CS), and a user segment (US).Space segmentThe space segment (SS) is composed of the orbiting GPS satellites, or Space Vehicles (SV) in GPS parlance. The GPS design calls for 24 SVs to be distributed equally among six circular orbital planes. The orbital planes are centered on the Earth, not rotating with respect to the distant stars. The six planes have approximately inclination (tilt relative to Earth's equator) and are separated by 60° right ascension of the ascending node (angle along the equator from a reference point to the orbit's intersection).Orbiting at an altitude of approximately 20,200 kilometers (12,600 miles or 10,900 nautical miles; orbital radius of 26,600 km (16,500 mi or 14,400 NM)), each SV makes two complete orbits each sidereal day, so it passes over the same location on Earth once each day. The orbits are arranged so that at least six satellites are always within line of sight from almost anywhere on Earth.window there are 30 actively broadcasting satellites in the GPS constellation. The additional satellites improve the precision of GPS receiver calculations by providing redundant measurements. With the increased number of satellites, the constellation was changed to a nonuniform arrangement. Such an arrangement was shown to improve reliability and availability of the system, relative to a uniform system, when multiple satellites fail.Control segmentThe flight paths of the satellites are tracked by US Air Force monitoring stations in Hawaii, Kwajalein, Ascension Island, Diego Garcia, and Colorado Springs, Colorado, along with monitor stations operated by the National Geospatial-Intelligence Agency (NGA). The tracking information is sent to the Air Force Space Command's master control station at Schriever Air Force Base, Colorado Springs, Colorado, which is operated by the 2d Space Operations Squadron (2 SOPS) of the United States Air Force (USAF). 2 SOPS contacts each GPS satellite regularly with a navigational update (using the ground antennas at Ascension Island, Diego Garcia, Kwajalein, and Colorado Springs). These updates synchronize the atomic clocks on board the satellites to within one microsecond and adjust the ephemeris of each satellite's internal orbital model. The updates are created by a Kalman Filter which uses inputs from the ground monitoring stations, space weather information, and other various inputs.User segmentThe user's GPS receiver is the user segment (US) of the GPS system. In general, GPS receivers are composed of an antenna, tuned to the frequencies transmitted by the satellites, receiver-processors, and a highly-stable clock (often a crystal oscillator). They may also include a display for providing location and speed information to the user. A receiver is often described by its number of channels: this signifies how many satellites it can monitor simultaneously. Originally limited to four or five, this has progressively increased over the years so that, as of 2006, receivers typically have between twelve and twenty channels.A GPS tracking unit is a device that uses the Global Positioning System to determine the precise location of a vehicle, person, or other asset to which it is attached and to record the position of the asset at regular intervals. The recorded location data can be stored within the tracking unit, or it may be transmitted to a central location data base, or internet-connected computer, using a cellular (GPRS), radio or satellite modem embedded in the unit. This allows the asset's location toe displayed against a map backdrop either in real-time or when analysing the track later, using customized software. Such systems are not new;amateur radio operators have been operating their free GPS-based nationwide realtime Automatic Packet Reporting System (APRS) since 1982.Types of GPS trackers.Usually, a GPS tracker will fall into one of these three categories:Data loggersA GPS logger simply logs the position of the device at regular intervals in its internal memory. Modern GPS loggers have either a memory card slot, or internal flash memory and a USB port. Some act as a USB flash drive. This allows downloading of the data for further analysis in a computer.These kind of devices are most suited for use by sport enthusiasts: They carry it while practising an outdoors sport, e.g. jogging or backpacking. When they return home, they download the data to a computer, to calculate the length and duration of the trip, or to overimpose their paths over a map with the aid of GIS software. GPS devices are also integral tools in geocaching.In the sport of gliding, competitors are sent to fly over closed circuit tasks of hundreds of kilometres. GPS loggers are used to prove that the competitors completed the task and stayed away from controlled airspace. The data stored over many hours in the loggers is downloaded after the flight is completed and is analysed by computing the start and finish times so determining the fastest competitors.Most digital cameras save the time a photo was taken. Provided the camera clock was reasonably accurate, this time can be correlated with GPS log data, to provide an accurate location. This can be added to the picture, and is called geotagging.In some Private Investigation cases, these data loggers are used to keep track of the vehicle or the fleet vehicle. The reason for using this device is so that a PI will not have to follow the target so closely and always has a backup source of data.Data pushersThis is the kind of devices used by the security industry, which pushes (i.e. "sends") the position of the device, at regular intervals, to a determined server, that can instantly analyze the data.These devices started to become popular and cheaper at the same time as mobile phones. The falling prices of the SMS services, and smaller sizes of phone allowed to integrate the technologies at a fair price. A GPS receiver and a mobile phone sit side-by-side in the same box, powered by the same battery. At regular intervals, the phone sends a text message via SMS, containing the data from the GPS receiver.Some companies provide data "push" technology, enabling sophisticated GPS tracking in business environments, specifically organizations that employ a mobile workforce, such as a commercial fleet.The applications of these kind of trackers include:Fleet control. For example, a delivery or taxi company may put such a tracker in every of its vehicles, thus allowing the staff to know if a vehicle is on time or late, or is doing its assigned route. The same applies for armored trucks transporting valuable goods, as it allows to pinpoint the exact site of a possible robbery.Stolen vehicle searching. Owners of expensive cars can put a tracker in it, and "activate" them in case of theft. "Activate" means that a command is issued to the tracker, via SMS or otherwise, and it will start acting as a fleet control device, allowing the user to know where the thieves are.Animal control. When put on a wildlife animal (e.g. in a collar), it allows scientists to study its activities and migration patterns. Vaginal implant transmitters are used to mark the location where pregnant females give birth.[1] Animal tracking collars may also be put on domestic animals, to locate them in case they get lost.Race control. In some sports, such as gliding, participants are required to have a tracker with them. This allows, among other applications, for race officials to know if the participants are cheating, taking unexpected shortcuts or how far apart they are. This use has been featured in the movie "Rat Race", where some millionaires see the position of the racers in a wall map.Espionage/surveillance. When put on a person, or on his personal vehicle, it allows the person monitoring the tracking to know his/her habits. This application is used by private investigators, and also by some parents to track their children.[2]Internet Fun. Some Web 2.0 pioneers have created their own personal web pages that show their position constantly, and in real-time, on a map within their website. These usually use data push from a GPS enabled cell phone.See also: Automatic Vehicle LocationData pullersContrary to a data pusher, that sends the position of the device at regular intervals (push technology), these devices are always-on and can be queried as often as required (pull technology). This technology is not in widespread use, but an example of this kind of device is a computer connected to the Internet and running gpsd.These can often be used in the case where the location of the tracker will only need to be known occasionally e.g. placed in property that may be stolen.Data Pullers are coming into more common usage in the form of devices containing a GPS receiver and a cell phone which, when sent a special SMS message reply to the message with their location.Potential abuse of GPS trackersThese devices can also raise concerns about personal privacy. Over time, the information collected could reveal a typical pattern of movements.USAIn the US, the use of GPS trackers by police requires a search warrant in some circumstances, but use by a private citizen does not, as the Fourth Amendment does not limit the actions of private citizens. See United States vs. Garcia, Seventh Circuit Supreme Court.Of course, other laws, like the common law invasion of privacy tort as well as state criminal wiretapping statutes (for example, the wiretapping statute of the Commonwealth of Massachusetts, which is extremely restrictive) potentially cover the use of GPS tracking devices by private citizens without consent of the individual being so trace Countermeasures against GPS trackersThis section may contain original research or unverified claims.Please improve the article by adding references. See the talk page for details. (May 2008)The consumer electronics market was quick to offer remedies (radar detectors) to radar guns; a similar market may exist for devices to counter satellite tracking devices. Radio jamming of the relevant GPS or cell phone frequencies would be an option, as would a device which could detect the RF emissions of the GPS receiver circuitry. However, jamming of GPS signals could create a safety hazard to vehicles or aircraft within line of sight of the jammer, and any deliberate radio interference is likely to be illegal in most Western countries.Besides this, jamming the transmission frequency of an industrial grade GPS transmitter would only work temporarily because most of them use a "store and forward" procedure to store up points that were not received and transmit them again later. This capability is built-in so tracked vehicles don't lose data when they are out of cellular range temporarily. Jamming the actual GPS frequency, however, would result in the GPS transmitter simply thinking it had lost sight of the satellites See alsoAutomatic Position Reporting SystemElectronic taggingGPS Wildlife TrackingGPS TimingIntelligent transportation systemReal-time locatingSurveillanceTelematicsVehicle Infrastructure IntegrationVehicle TrackingReferences^ Apt Online - Evaluation Of Vaginal Implant Transmitters In Elk (Cervus Elaphus Nelsoni)^ Russia Today: HIgh-tech trackers to help parentsTotally Free GPS Software3DEM for Windows will produce three dimensional terrain scenes and flyby animations.3D Route Builder lets you build or edit GPS routes in Google Earth with altitude and time-stamp information. Real-time playback is possible.3D Tracking - Using your mobile phone or PDA, along with your GPS receiver, you can record and view your movements in detail on Google Earth or Google Maps.8Motions is a mobile application, similar in some ways to Google Map, but providing different services.Active GPX Route Player is an easy to use "media player" for GPS files.AddMagMap adds custom objects to MapSend maps.amAze is for the Java-enabled mobile phone, covering the US and 15 European countries - visual and voice guidance to any destination; search or define any location by its address.AnalyzeMyTrack! evaluates gpx log from your GPS device and provides reverse geocoding, maps, stats, and graphs.APRS is free GPS software for use with packet radio by ham radio operators and non-hams alike. You can monitor, in real time, such information as the location of vehicles, current weather, and much more.Async & RINEX - Programs to log and use raw data from the following Garmin handheld receivers: GPS12, 12XL, II+, III+, Etrex, EmapBasenav is free GPS navigation software for mobile devices which support java (J2ME). It is developed for nautical navigation, but can also be used for biking, hiking, and more.BikeAtor (German) - for Motorola A780 - includes touchscreen support and offline raster maps.BikeTrack enables everyone who has your user/pass to look up your location on the net.BikeXperience - training planning and unit administration.BlueGPS is a simple command line tool to download datalogs from the Royaltek RBT-3000 bluetooth GPS receiver under Linux.BMap2MP converts raster images into vector polygons, and creates map code for those polygons in the .mp Polish map format. This code can then be compiled into Garmin .img map files using the free or paid versions of cgpsmapper.BSGPS - Free GPS Software to run on Windows laptops. Full support as static maps and Openstreetmap tile maps.BT747 MTK Logger Control is a multi-platform (Linux/windows/OSX) java solution that allows the control and data-retrieval from several GPS loggers.Buddy Locator - you can see what your friends are up to. You can locate both them and yourself on the map.BuddyWay is a free GPS track maker for mobile devices that allows you to track any mobile phone or PDA with built-in GPS (or with Bluetooth GPS receiver) in real time.Cetus GPS (for Palm OS) is the Swiss Army Knife of GPS tracking and field data collection. It is intended for use by GIS surveyors, scientists, explorers and GPS enthusiasts who need to extend the features of their standard GPS equipment.cGPSmapper creates maps for Garmin units.ChartPlotter is a Java based moving map program for use with GPS units that support the NMEA communication protocol (the GPGLL sentence).chtiGPS is intended for sportsmen and hikers for training and to locate itself by knowing the distance and the direction from the closest cities.Citysense analyzes anonymous historic and real-time GPS and WiFi location data collected from cell phones, GPS receivers, WiFi-WLAN hotspots, and taxis over the last few years combined with real-time feeds to display a heatmap of the most popular places at a given time.Clew is a chart plotting program.CMapECS Route Manager is an experimental utility that will extract waypoint and route information from CMapECS and upload it to a Garmin GPS.convertMMOoutput is a command line utility to convert *.img files and *.lay files created with MobileMapper Office to a format acceptable by Magellan GPSRs and MapSend.CotoGPS (Palm OS) - displays position numerically and graphically; capture, calculate, and draw distances, tracks, and areas.CourseLogV2 - an EWE application that runs under Windows Mobile 2005, WM 6 using your GPS receiver to tell you where you are, how long and how far you've gone, and where you've been.Cumulus is a program for Qtopia and OPIE, aimed at the soaring community. Cumulus runs on Zaurus and iPaq hardware with a Linux OS.CycleAtlas is for managing track rides, mainly intented for cycling and other open air sports.DGPSIP is a system to send DGPS corrections over the Internet.DNR Garmin provides users the ability to directly transfer data between Garmin GPS handheld receivers and various GIS software packages.Earth Bridge is designed to bridge the gap between Google Earth and your GPS receiver. See your location on Google Earth in real-time and easily control your view.Earthcomber lets users specify types of restaurants, shops, ATMs, hotels, landmarks that it seeks and plots on a map.EasyGPS is free GPS software that allows you to create, edit, and transfer waypoints and routes between your computer and your Garmin, Magellan, or Lowrance GPS.Easy GPS Tester will automatically detect your USB or serial GPS device and display the COM port and baud rate settings required to use it.eGPSTrack - GPS/J2ME Mobile application for tracking and mountain routes.Elgaard Positioning System (Java based) provides an interface capability of saving tracks from units with NMEA format output.EveryTrail - Upload your tracks and corresponding photos with automated geotagging and share with the community.FastFoot-Challenge is an adaption of the Scotland Yard board game played in real life.FindMe is a free GPS utility for Pocket PC Phone Edition that will help your friends immediately find your whereabouts just by sending an SMS.flexGPS enables the manipulation of maps used with a GPS Receiver.FlightTrack (MacOS X) can be used to download tracks and waypoints from a GPS and display them in 3D.FoxyTag - A system that posts virtual tags close to speed cameras in order to warn the other drivers.FreeCaddie is a golf rangefinder for Windows Mobile devices.G7ToCE is designed to transfer data between Garmin, Magellan, or Lowrance/Eagle GPS units and Pocket PC.G7ToWin is free GPS software designed to exchange information between a PC and Garmin, Magellan, or Lowrance/Eagle GPS receivers.Gar2rnx allows you to receive coordinates and much more from some Garmin GPS units using undocumented commands.GarFile is a software tool (Windows) for bidirectional transfer of waypoint, route, or trackpoint data between Garmin GPS receivers and MapInfo.Garmap CE runs on PCs or Pocket PCs running Windows CE 2.0 (and maybe later).Return to GPS HomeGarmap Win is free GPS software that can be used with Garmin GPS receivers to manage waypoints, routes, and track logs.Garmin Communicator Plugin is a browser plugin that sends and retrieves data from Garmin GPS devices.GARNIX enables transfer of data between MS-DOS/Windows/Linux computers and a Garmin GPS receiver.gd2 was designed to communicate with Garmin GPS receivers via a serial port using Garmin's proprietary protocol. It can download information such as the current position or time, track log or satellite almanac, and download or upload user routes and waypoints.Geocache Navigator is free geocaching software for Nokia N95, N82, and 6110 Navigator GPS phones. turns Adobe Reader into a geospatial application that gives users the ability to view, manipulate and update mapping data while leveraging Adobe collaboration capabilities to share information with others in the field and at home base.GeoSetter is a freeware tool for Windows for showing and changing geo data of image files (e.g. images taken by digital cameras).GEOsnapper geo-tags your photos to make them searchable by location.GeoTours creates GPS tours that can contain images, audio, and text associated with geographic locations.GEOTracing is a software platform for creating multimedial geo-applications.GeoVisu is a program that displays georeferenced data (images, graphics) and downloads data recorded by some GPS devices.ggps displays GPS satellite position and signal strength information.gipfel helps to find the names of mountains or points of interest on a picture.GITMapPointCreateTrack converts GPS logs in NMEA format created with a RoyalTek RBT3000 GPS, VisualGPS or VisualGPSce or TomTom Navigator to a track in Microsoft MapPoint.GlobalUTM is a MapInfo add-on for the supplemental display of the current cursor position in UTM coordinates in the best-matching, automatically selected / changed UTM zone.GMAP is a map editor for GPS maps that runs on Linux.GMapToGPX converts Google Maps data to GPX.Gnomad - GPS Street Map Viewer for Linux. Gnomad is a mapping tools for open systems and GPSs with open specs.Google Maps for Mobile allows you to determine your current location with or without GPS, get driving and transit directions, and get phone numbers and addresses for local businesses.Google Maps Tracker is a tracking application that runs on your phone, talks to a GPS and enables you or other authorized people to see where you are on a Google Map.Google Maps With GPS Tracker shows your physical position in real-time on a moving Google Map.Google Navigator - For the Pocket PC.GooPs is a companion to Google Earth that shows you where you are in real-time.Gosmore is a routing and viewer of OSM XML data such as the planet.osm.GPicSync automatically inserts location in your photos metadata so they can also be used with any 'geocode aware' application like Picasa/Google Earth, Flickr, loc.alize.us, etc.GPilotS allows your PalmPilot to transfer waypoints, routes, and tracks to and from selected Garmin receivers.GPS2Blue transforms your PocketPC into an external bluetooth GPS receiver, allowing you to use it with your laptop PC or any other device that can use a bluetooth GPS.GPS2clipboard gets the GPS position data and copy them to the clipboard from where they can be pasted to any application with a paste command.GPS3D is a suite of free GPS software utilities to control a handheld GPS receiver from your PC and see the result in 3D.GPS3d is a small application that displays a texture-mapped earth and lets you interactively explore it in 3D.GPS4PPC includes several tools for working with maps and with GPS devices.GpsActionReplay (GpsAR) is software that enables replays and performance analysis from GPS data, incuding "real time" animation with several tracks, auto-focusing, a time-based controller, auto speed calculation, and auto data send.GPSBabel (Windows, OS X, Linux) manipulates and transfers waypoints, tracks, and routes between receivers and/or popular mapping programs.GPSBabelWrapper allows you to use GPSBabel via Windows interface.GPSbySMS is for Pocket PC with OS Windows SE Phone Edition and Windows Mobile 5.0 - it reads navigation data from GPS and sends it to any user via SMS or email.GPSCommunicator visually represent NMEA GPS position data in realtime.GPS Compass reads your GPS heading and displays compass direction.GPS Connect - waypoint transfer for serial based Garmin GPS receivers and Mac OS-X.GPS Cookie is companion software to A2B. A2B is a website where you can search for websites related to any place on Earth.GPSd is a service daemon that monitors one or more GPSs attached to a host computer through serial or USB ports.GPSDiag (Windows 95, 98, ME, NT & 2000) - monitor incoming NMEA GPS messages from a serial port.GPSdings is a java 1.5 command line tool for the manipulation and analysis of track and waypoint data recorded with a gps receiver.GpsDiffuser - Real time and delayed time GPS localization data diffusion.GpsDrive is a car (bike, ship, plane) navigation system. GpsDrive displays your position provided from your GPS receiver on a zoomable map.GPSed is a location-based service for trip tracking from mobile. In real time tracks are traced on Google maps and stored in an online archive.GPSengine displays location data transferred from a connected GPS receiver and write it to a sequential file.GPSExplorer is a program for communicating with Garmin GPS units and is easily extended with a plugin functionality.gps feed + is a gps simulator usable for testing all kinds of GPS applications.GPS.Friend allows you to get and review your current geographic location, request someone's phone to give you his/her location, and review on the map your and someone's location.GPSGO is the international version of GPSMap-OS, using geographic coordinate calibration so that it works with map images from any source.GPS GPX Interactive Map allows you to view your GPS information as you travel.GPSi (GPS Interface) is an ArcMap Toolbar that allows users to communicate with Garmin handheld GPS units.GPSion5 allows a Psion 5mx to communicate with a Magellan 315/320.GPSka - A j2me app for navigationGPSMan makes for easy and flexible manipulation of GPS data. It allows data transfer and real-time logging for Garmin, Magellan, and Lowrance units.GPS Map Explorer view and analyze track logs in various ways - for Garmin.GPSMap-OS (Pocket PC)reads GPS information from NMEA-compatible receivers and plots current and historical position over user-supplied map images in British OSGB format.GPS Mission is a next generation mobile GPS multiplayer scavenger hunt game.GPSMonitor (Windows) decodes NMEA strings that come in via a serial connection and translates them into human readable form.GPSPedoRunner estimates the amount of calories you are burning.GPSPhotoLinker can be used to save location and GPS position data to a photo.GPS Planner generates GPX data from Google Maps.GPS Position Producer polls GPS positions from a GPS receiver connected to the gateway by a serial link or other receiver.GPS Process downloads and processes USGS GNIS data and outputs a gpx file or shapefile.GPSRACE.CH - upload your GPS data and you can define race routes, then you can compete against others on that virtual race.GPS Radar allows you to use your Windows Origami device to monitor your localization by GPS receiver, save the track and points of moving, generate various XML reports, and live export results to Google Earth.GPS-Route - In GermanGPS Route Planner - Using a Garmin Edge to plot cycle routes with Google Maps on Linux, Macs, and Windows.GPSS - in-car navigation and remote tracking demonstrations. Run on a laptop with a GPS and it will work for real.GPS Speedo turns your GPS and Pocket PC into a speedometer.GPS Sway handles all forms of latitude and longitude as well as UTM coordinates and will convert from any form to another.GPSTk provides both fundamental and advanced GPS processing algorithms.GPS Today is a screen plugin that shows your position using a GPS unit.GPS Track connects to a GPS and records the path that you travel.GPS Tracker allows someone to track a GPS enabled cell phone using Google maps.GPS TrackMaker - Free GPS software for PC with Microsoft Windows 95 or higher. It creates, edits and deletes tracklogs, routes, and waypoints.GPS Tracks and Maps allows you to upload GPS tracks, routes, and waypoints and overlay that data onto aerial, street, and topographic maps.GPS Track Viewer - view your tracks on Google Maps.GPS Trail Browser lets you view both the maps and web links contained in an internet map by providing both web browser and a map viewer tabs.GPStrans enables waypoint, track, and route information to be exchanged with a Garmin receiver.GPS Utility provides management, manipulation, and mapping of GPS information.GPS Viewer shows the time, the current location, the speed, and the moving direction on the display of the mobile phone and runs on all phones, which at least support CLDC 1.0 and MIDP 2.0 and which allow access to Bluetooth (JSR 82) or the serial interface.GPS Viewer GPS navigation with raster and vector diagram.GPS Visualizer is a free on-line utility that creates SVG & JPEG maps and profiles from GPS data, street addresses, or simple coordinates.GPSylon is able to show maps downloaded from the expedia map servers. It may connect to a gps device and track your position on the maps.gpx2map reads a GPS track in GPX format and writes out a Google or Yahoo Map mash-up containing the route.GPX2SHP converts GPS or GPX file to ESRI Shape file.GPX Loader is a web page template that can be used to display GPS data inside a clickable and scrollable Google Map.Grazer writes GPS geodata into the EXIF information of digital pictures.GridHIKER is basic GPS software for handheld units, recommended for paper map enthusiasts attempting to determine their position.GSAK - geocaching and waypoint management tool.Happy Camel - geotaggingHipoqih is a system composed of a Web for mobile devices that allows recording warnings and URL associated to any geopoint in the planet.iGKeys - Hotkeys for iNav iGuidance. iGkeys simplifies the usage of iNav iGuidance on laptops.IMG2GPS is a Windows GUI for the SendMap/Sendmap20 DOS application by gps_mapper.InstaMapper is a free GPS tracking service. Track vehicles or other objects online in real-time using inexpensive cell phones.IPaNema reads any NMEA data from one of the serial ports and delivers the NMEA data to any user selectable port and IP address.ITNConv - convert a route contained in a file of Express Highway, MapPoint, or MapSource to a file used by TomTom 3, 5, 6, Go, One, and Rider, Navigon MN 4, 5 and 6, Destinator PN, Google Earth, CartoExploreur or GPX.J2ME Map is an interface to GoogleMaps.Jeeps is a library of functions written in ANSI C for communicating with Garmin GPS receivers.JOSM is an editor for OpenStreetMap written in Java 1.5.JPGParseGPS - A Windows DOS/Console application to parse a directory of JPG files displaying their lat/long values.Karto allows you to calibrate a scanned map with some known geo-points (Lambert, UTM, etc.).Kashmir 3D is a program to allow 3D navigation with a GPS device. It also creates landscapes and 3D maps.KM GPS AutoDetect allows you to locate and connect to your GPS device.KML Polygon Creator is a basic digitizer with a Google Maps interface for creating KML polyline and polygon files.LaserMap is a mobile GPS/mapping solution for navigation for Windows CE.Le Petit Poucet - display and edit GPS routes and tracks in a 3D scene.Livecontacts is free GPS software for Symbian smartphones and Windows Mobile PDAs to let your friends know where you are.Loadstone GPS - navigation software developed for Symbian Mobile/phones using the Series60 platform.LocateA offers live vehicle tracking locating the live positions of moving objects, whether they be cars, vans, trucks, people, smart phones, or PDAs.LocationSMS allows you to send your coordinates in SMS.LocEight allows users to upload their GPS data, add photos, tracks and POIs, and publish it all on Google Maps or output it in GPX or KML.Locify provides information or services relevant to your location when you ask for a particular web page on your phone.locr is geotagging software.LogConverter can be used to show the track stored in TomTom Navigator, ALK CoPilot, Navman SmartST, and Delorme Blue Logger log files by converting them to a format suitable for display in a mapping program on a PC.Maemo Mapper is geographical mapping softare specifically designed for the Maemo platform and the Nokia 770 form factor.MakePOIaccept is a command line utility to automatically create all necessary modifications of MapSend to accept POIs.MapEditor - manipulate and postprocess the tracks generated by the NavSys system and generate street maps.MapExtract is a tool to extract selected pieces from large maps and load them into your Garmin GPS.MapGeneration Project collects GPS data from all over the world and automatically create a digital road map that is freely available for everybody.MapItPronto - You can use this tool to Upload/View GPS Routes and plot as well as planning a future route.MAPKon processes and converts tracks, routes, and waypoints.Map Maker - Free map editor and viewer. Gives students and novice users the opportunity to learn the basics of map making and GIS.MapMan - A map generating tool designed primarily for owners of Garmin GPS devices with mapping capability.Map Mobile Navigator (MapNav) - An application for Java2ME-enabled mobile phones and PDAs.Map Monkey is gps navigation enhancement for Destinator SDK.MapSend Lite enables you to use your MapSend and Magellan Certified maps directly on your PC.MapSetToolKit is a front-end app for cGPSmapper.maps4free - A community project that collects GPS data and creates vector-based topographic maps to be available for free.MapSphere is a mapping software for Windows.MAPupload is a program for uploading of IMG map files into Garmin GPS units.Mapview is a viewer for Terraserver tiles.MapWelt is a moving map program for PocketPCs and Smartphones with Windows Mobile.Marengo GPS Route Planner is based on Google maps and is designed specifically to allow users to crate GPX route files for upload to a GPS unit.mdNavMobile is a waypoint-based GPS navigation solution for the Windows Mobile platform.MGPS is free GPS software designed to visualize and edit GPS data.Mkgmap converts OpenStreetMap data into a map that can be loaded onto a Garmin GPS device.MMOconverter is a Windows GUI program to convert *.img files and *.lay files created with MobileMapper Office to format acceptable by Magellan receivers and MapSend.Mobile GMaps displays Google Maps, Yahoo! Maps, Windows Live Local (MSN Virtual Earth) and Ask.com Maps and satellite imagery on Java J2ME-enabled mobile phones, PDAs, and other devices.MobiRunner can act as as stopwatch/running watch and together with a GPS it can show distance, lap time, speed, etc.Mologogo will track a friend's GPS enabled cell phone from another phone or the Web. It currently works on most Nextel phones with Java, GPS and a data plan.MotionBased is a web application that translates GPS data into functional analysis and online mapping for endurance and outdoor athletes.Movmap GPS Tracker is a simple freeware GPS tracking program meant for WinCE/PocketPC machines.Moving Map requires either an external Bluetooth GPS or an inbuilt GPS (for example as in the BlackBerry 8800 or the Nokia N95) and provides moving map functionality.MSmapView modifies or creates new look definitions of any object in MapSend/MMO.MTBGuru can upload and share your GPS data and photos taken during your outdoor adventures to the site.MyMotion is for route recording and playback with customizable spoken feedback of speed, distance, and time.MyGPS is for the creation and management of lon/lat calibrated maps.MyGPS_PDA is a light MyGPS version for PocketPC systems.My Tracking - Vehicle tracking for small business and personal use. Works on iDen phones, Windows Mobile PocketPC and smartPhones, and Nokia.Nav4All - Navigation software for GPS and cell phone.NavFun - for Nokia - have all the goodies of Google Maps and Google Earth on your mobile.Navideo Basic is a multi purpose application for PDA that combines navigation with mobile communication.NaviExpert - (Polish)Navigami - (Java mobile phones) navigation software for offline navigation and vector maps of all countries of the world.Navigator is a stand-alone application for real time GPS navigation in Google Earth.Navit is a car navigation system with routing engine.Nav'it! Bookmarklet sends Google Maps search results to your GPS.Nav'it! Mapplet sends any position marker from any source directly to your GPS.Navizon is a wireless positioning system that triangulates signals broadcasted from Wi-Fi access points and Cellular towers to help the users find their way in most major metropolitan areas worldwide.Navlet is a navigation system for mobile devices (PDAs, smartphones, cell phones, etc.). It gets the positioning data from any NMEA capable GPS receiver and displays the position on a digital map.NavSys is a combined media player / GPS navigation application to be used in a vehicle.NDWGeoTag is the Windows version of the two Dos/Console programs GeoTagGpx and JPGParseGPS combined.Net::Friends allows for the reporting to and querying of GPSDrive-style friendsd servers.NetGPS - see where people are in real-time. Requires Oziexplorer.NMEA Compass - A skinnable compass which uses SiRF or NMEA0183 data from your GPSNMEA Generator produces GPS NMEA of data records and simulates a moving object.NMEAgent is an averaging program designed to collect and average multiple GPS Lat/Long readings in an effort to produce an accurate location Lat/Long.NMEAP is an extensible parser for NMEA-0183 (GPS) data, written in portable C.NMEASleuth allows you to inspect NMEA data streams from devices connected via a serial port.Nokia Location Tagger - geotaggingNokia Sports Tracker is a GPS based activity tracker that runs on S60 Smartphones.NoniGPSPlot allows you to locate you position in relation with other GPS points to see the journey you have travelled.NPGPX is a Qt-based Netscape plugin that displays GPX files with waypoints, routes, and tracks embedded in a webpage, with optional background maps.O2PosTrack is a console based C++ application for retrieving position information from a mobile phone as provided by the O2 mobile phone company.ODGPS is a program for Pocket PCs that lets you navigate in any terrain using GPS.Odysseus - navigation softwareOkMap - calibrate raster maps, create vectorial maps, display simultaneously raster maps and vectorial data, import digital data, create on maps waypoints, routes, and tracks, use digital terrain models.Online Track and Waypoints Visualization visualizes over a map tracks and waypoints saved within a specific user file.OmniKML - transfer NMEA files to Google Earth (this is a direct download link for a zip file).Online GPX Viewer is (get ready for this!) an online GPX viewer.Opanda IExif - Exif/GPS/IPTC data browser designed for the photographer.OpenDMTP - is a protocol and framework that allows bi-directional data communications between servers and devices (clients) over the Internet and similar networks.OpenGTS - open source project designed specifically to provide web-based GPS tracking services for a "fleet" of vehicles.OpenTom MP3 Player is an MP3 player for the TomTom Go.PerDiemCo Location & Tracking (PLT) allows you to track your trip and lets others locate and follow you online.PhotoMapper - geotaggingPhotoTrackr Mac is a GPS photo tagging system.PocketGPS-Map views calibrated bitmap maps (moving maps) on PocketPC/WinCE platform.Pocket mCaddy GPS provides accurate golf yardages on your Pocket PC.POIConverter will convert POIs, routes, and tracks between selected formats.POI_DB_creator creates POI database compatible with MapSend/MMO either from manual input or from CSV plain text file.POI_DB_extractor extracts MapSend POI database.PoiEdit manages all of your POI files from your desktop PC and saves/loads them to/from your mobile device.POIGrouper can be used to extract subsets of POIs from files in TomTom overlay format (*.ov2) and AutoRoute Comma Separated Value format (*.csv).POIManager can be used to create, update and check TomTom Navigator POI overlay files for use on the PocketPC.Port Splitter - share data of one COM port between several applications.Position is a GNUstep GPS navigator.Prune is an application for managing coordinate data from GPS systems.PText2shp converts Garmin maps (source in Polish Text Format (Polish MapFormat)) to ESRI shape files with filtering by levels.PTGMAP is designed for GPS navigation with Garmin and Polish format vector maps on Pocket PC devices equipped with a GPS receiver.PyGarmin is a set of Python classes which implement the protocol used by Garmin GPS receivers to talk to each other and to other machines.PyGPS records a track, records notes, shows you satellites, and shows your position on a map. Runs on any machine which supports Python, pygtk, and libglade.PyTrackProfiler allows you to create high quality route sheets, useful for planning various kinds of routes.PyTrainer is a tool to log your sport activities.Qibla Compass shows you the direction to Makkah in relation to the position of the sun.QLandkarte - use your Garmin GPS with Linux.qpeGPS is a program for displaying a moving map centered at the position read from a GPS device. It's an open source project aimed at users of Linux PDA's.QGPS is a small GPS status program written from scratch in Qt.QtGPS is a moving map program for use with GPS units that support the NMEA communication protocol, and is based on the Qt widget library.QuakeMap is a GPS mapping program.Quantum GIS (Linux, Unix, Mac OSX, and Windows) lets you browse and create map data on your computer.RealMaps - GPS moving map comparisons.Remote Tracker - Antitheft software to track your Windows Mobile device when it is lost or stolen.Reperion/PocketReperion - send your GPS location to the Reperion/Pocket Reperion server, which in turn will present your location, track, pictures and audio via a web interface.richesseGPS is a small navigator for geocaching.RINEX & Async is free GPS software to log and use raw data from the following Garmin handheld receivers: GPS12, 12XL, II+, III+, eTrex, Emap.Roadbook On-Board is a system that allows the easy creation of roadbooks through graphical description of routes using reference points.RoadMap is an open source program that provides a car navigation for Linux, UNIX, and Windows CE.RoadNav is an in-car navigation system capable of running on a variety of operating systems, including Linux, Windows, and Mac OS X.RouteConverter is a tool to convert routes (really).RS232 Data Logger allows you to redirect all communication data from RS232 compliant serial port device into a text file for further analysis.SeaClear is a PC-based chart plotter for Windows 2000/XP/NT/95/98/ME.Search Google Maps is a small gadget for Windows Vista that lets you make consultations and searches in Google Maps directly from your desktop.SearchQuest GPS is a location-based utilities and travel guide that is a suite of location-based utilities that leverage location, communication, and content from the Internet. For iPhone 2.0 software update.sendMap is for uploading maps to your GPS.ShowCcenter shows MapSend hidden track control center.Shp2csv converts point SHP files to text files for more convinient way to import in POI_DB_creator.SirfTech is a program for checking and setting practically all SiRF GPS settings and evaluating changes.Smart2go is a compact program for your mobile that allows you to load maps from around the world.Software-On-Board (SOB) is a PC-based navigation program which, when loaded with C-MAP charts and connected to a GPS gives real-time on-screen chart positioning and details such as speed and heading.SportTracks is GPS-enabled exercise logbook software.st2gpx converts Microsoft Map to/from GPX XML.ST_to_GPS - upload and create routes from Microsoft Streets & Trips to a GPS receiver.S&T Keys - Hotkeys for Microsoft Streets & Trips. S&T Keys simplifies the usage of Microsoft Streets & Trips for GPS navigation use.tangoGPS is a fast and lightweight mapping application that runs on any Linux platform.TDCGPS allows GPS data to be used to mark your position on a map. It works with the Psion 3a to read NMEA information from Rockwell and other units.Terracrosser is a navigation tool for Pocket PC GPS and is supplied with Mapper module for downloading maps from Google Maps.Tiger Mapping and Routing Server (TMRS) was written in order to facilitate the creation of open source GPS navigation software. Its goal is to simplify street level routing and map drawing functions essential for developing user-friendly interfaces.TinyGPX processes GPX files from geocaching.com and outputs super-compact HTML file with the essential cache information.TOPO_creator creates custom Topo maps compatible with MapSend/MMO.TOPO_extractor extracts topograhic info from MapSend's BLX files.TopoFusion is GPS Mapping software for Windows.TopoShare - For use in North America - This site makes it possible to create, store and share routes and tracks using gpx.Tourality - Outdoor GPS multi-player game for mobile phones.Tourgi is an online tour guide that delivers audio sightseeing narratives to your computer or mobile device. You can listen at your own pace, while you visit each sight, and your entire travelling party can enjoy a narrated tour of the city.TrackMe stores GPS positions and uses that information to generate KML files that can be used by Google Earth or Google Maps for displaying realtime or prerecorded tracks.TrackMyJourney is a mobile-phone GPS package with integrated web-based GPS tracking.Track 'n Share allows you to plot tracks on a satellite map of the world, add photos and videos positioned along the track exactly where you have taken them, and add your stories about your adventures.Track Profiler (Java) is a small free utility for exporting GPS track profiles into PNG images.TrackRoad is a route optimizer.TrafficGPS is primarily intended for the explorer (tracking, hiking, and general exploration work).Trailgauge is 3D GPS mapping software for Windows.Trailguru makes finding and sharing routes easier by combining GPS track data from multiple outings to produce a comprehensive route database.TrekBuddy - J2ME application for GPS navigation and tracking.Trimble's Planning software is a tool supporting any form of analysis to determine visibility for GPS, GLONASS, IGSO, and geostationary satellites.Trip Tracker is a position tracking client-server system. It's designed to assist people in setting up a realtime tracking environment with either a private or public tracking server.Trip Tracker Sportsmate allows GPS users to view and analyze their recreational and sports activities (tracks). The track will be viewed in Gmaps, and users can analyse different metrics (speed, distance, heartbeat, and more).TritonRMP creates custom raster maps compatible with Triton receivers and Vantage Point software.Turbo GPS - flexible off-line GPS application for Windows, available in x86/x64/PPC2003/wm5/wm6.TUX GPS - The goal of this project is to port uClinux to the Magellan GPS receivers and write the open source firmware that includes navigational and mapping applications using open map and database formats.Tyre makes Google Maps and your TomTom work together.uploadGPSserial uploads maps to Magellan receivers via serial.USAPhotoMaps downloads USGS aerial photo and topo map data from Microsoft's free TerraServer Web site, saves it on your hard drive, and creates maps with GPS accuracy.USGS GNIS to GPX Converter will take USGS GNIS csv files from the GNIS database and convert them into usable GPX files.uTrack can be used to track mobile devices in a passive, non-intruisive way and can be configured to publish the location of a Windows Mobile powered device to any website.Viking is a program to manage GPS data.vlkGPS - simple GPS navigation for java phones for geocaching, walking, cycling, sports, etc.VisualGPS displays all satellites that are in view.VITO FindMe is a free GPS utility for Pocket PC Phone Edition that will help your friends immediately find your whereabouts just by sending an SMS.Watchee allows you to show your friends in real time where you are and send messages to their mobiles or to the Web browser watching you.Wayfinder Active is a free GPS application for mobile phones with a combination of maps, GPS recording and statistics.Wayp2shp allows you to map the tracklines, waypoints, and routes from a Garmin GPS receiver in ESRI's ArcView and ArcExplorer.Waypoint+ is free GPS software that enables one to exchange waypoint, route, and track data between a PC and some Garmin receivers.Wayviewer - Java based app offers navigation in Europe and North America.We-Travel is navigation software for java enabled mobile phones, based on map data from Open Street Map.WIGS is both an API to talk to a GPS receiver over the serial port via the NMEA protocol supported by most GPS receivers, as well as an application that use this API.Wikiloc helps you discover, post, and share GPS data on the web easily and quickly.WinCAB runs the Microsoft utility CABARC to create CAB and TOC files for TomTom POI files (*.ov2) and Itinerary files (*.itn).Windmill LabIML is used to collect live data from your GPS receiver on your laptop.WinGPS 4L Mobile Lite plots your position, speed, course, and track on the digital charts on your PocketPC.WinOV2 runs the TomTom Navigator command line program DumpOV2 to extract the POI entries contained in an overlay file (.ov2) and writes them to an ASCII text file (.asc).Wissenbach Map3D allows you to: plan hiking, skiing, and mountain bike trips; download and upload trails, routes, and waypoints to and from Garmin GPS receivers.WMGpsShow is a simple utility that shows/hides the GPS icon in Settings > Connections.WMMiniGPS is a Windows Mobile 5/6 software which gets your GPS data in a really simple gui.WMSBrowser is a WMS client map browser with Bluetooth GPS support and tracking/waypoint features for your mobile phone or PDA.XASTIR is program for receiving and plotting APRS position packets.xImage allows you to retrieve and update images on your Garmin GPS.XPort3 - COM port splitter for Windows XP and all GPS/navigation software.xgps is a simple test client for gpsd with an X interface. It displays current GPS position/time/velocity information and the locations of accessible satellites.zGPS is a program for displaying GPS information from an attached GPS unit on the Zaurus, or iPaq handheld.ZipSearch can be used to extract sets of TomTom Navigator POI data from a large database of US ZIP Codes.