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Global Positioning Systems |
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The Global Positioning System (GPS) is a satellite based navigation system made up of a network of 24 satellites that orbit the earth which can pinpoint your position anywhere on the globe, usually within a few yards or meters. GPS was originally intended for military applications, but in the 1980's, the government made the system available for general population use. GPS works in any weather conditions, anywhere around the world, 24 hours per day. GPS has a variety of applications on land, at sea, and in the air. GPS is usable everywhere except where it is impossible to receive the satellite signal such as most buildings, in caves, and other subterranean locations, and underwater. GPS is popular among hikers, hunters, snowmobilers, mountain bikers, and cross-country skiers. GPS is now widely used in automobiles. More sophisticated systems that show your position on a street map are also available. Basically anyone who needs to keep track of where he or she is, to find his or her way to a specific location, or know what direction and how fast he or she is going can utilize the benefits of the global positioning system. Product Subcategories: GPS Receivers Marine GPS GPS Accessories  GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use triangulation to calculate the user's exact location. Essentially the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the units electronic map. Once the position is determined, the GPS unit can calculate other information such as speed, bearing, track, trip distance, distance to destination, sunrise and sunset time and more. 
  BUSHNELL 20-CHANNEL HANDHELD GPS RECEIVER (WITHOUT 16-LEVEL GRAYSCALE LCD) GARMIN 128 MB GPSMAP® 76CSX (WITH BAROMETRIC ALTIMETER & COMPASS) GARMIN 128 MB GPSMAP® 76CX (WITHOUT BAROMETRIC ALTIMETER & ELECTRONIC COMPASS) GARMIN 64 MB GPSMAP® (60CSX WITH BAROMETRIC ALTIMETER & COMPASS) GARMIN 64 MB GPSMAP® (60CX WITHOUT BAROMETRIC ALTIMETER & COMPASS) GARMIN ASTRO™ 220 DOG TRACKING GPS RECEIVER GARMIN ASTRO™ DOG TRACKING SYSTEM COMBO UNIT GARMIN EDGE 705 GPS BUNDLE GARMIN EDGE™ 205 BICYCLE MONITOR WITH GPS GARMIN EDGE™ 305 BICYCLE MONITOR WITH GPS GARMIN EDGE™ 305 GPS BUNDLE GARMIN EDGE™ 305HR BICYCLE MONITOR WITH GPS & BAROMETRIC SENSOR GARMIN eTrex Vista GARMIN ETREX® H COMPACT GPS RECEIVER GARMIN ETREX® LEGEND® HCX GPS RECEIVER GARMIN ETREX® SUMMIT® HC GPS RECEIVER GARMIN ETREX® VENTURE® HC GPS RECEIVER GARMIN ETREX® VISTA® GPS RECEIVER GARMIN Forerunner 205 GARMIN FORERUNNER 405 WITH ANT+SPORT(TM) WIRELESS TECHNOLOGY (BLACK) GARMIN FORERUNNER 405 WITH ANT+SPORT(TM) WIRELESS TECHNOLOGY (GREEN) GARMIN FORERUNNER 405 WITH HEART RATE MONITOR & ANT+SPORT(TM) WIRELESS TECHNOLOGY (BLACK) GARMIN FORERUNNER 405 WITH HEART RATE MONITOR & ANT+SPORT(TM) WIRELESS TECHNOLOGY (GREEN) GARMIN Forerunner™ 101 GARMIN FORERUNNER™ 301 GPS RECEIVER PERSONAL TRAINING DEVICE GARMIN FORERUNNER® 305 GPS RECEIVER WITH HEART RATE MONITOR GARMIN FORERUNNER® 50 (WITH FOOT POD) GARMIN FORERUNNER® 50 (WITH HEART RATE MONITOR & FOOT POD) GARMIN FORERUNNER® 50 (WITH HEART RATE MONITOR) GARMIN Foretrex 101 GPS Receiver GARMIN Foretrex™ 201 GARMIN GPS 10 DELUXE with Bluetoothª Technology GARMIN GPS 60 Personal Navigation Unit GARMIN GPS 72 GARMIN GPSMAP 378 GPS Receiver GARMIN GPSMAP 478 GPS Receiver GARMIN GPSMAP 60 Personal Navigation Unit GARMIN GPSMAP® 376C PORTABLE CHARTER GARMIN GPSMAP® 440S RECEIVERS GARMIN GTM(TM) 12 TRAFFIC RECEIVER & ANTENNA GARMIN MOBILE 10 GPS RECEIVER FOR BLUETOOTH® DEVICE GARMIN MOBILE 10 GPS RECEIVER FOR SMARTPHONES GARMIN MOBILE 20 GPS RECEIVER FOR SMARTPHONE GARMIN NUVI 5000 TRAVEL ASSISTANT GARMIN NUVI 750 TRAVEL ASSISTANT GARMIN NUVI 760 TRAVEL ASSISTANT GARMIN NUVI 770 TRAVEL ASSISTANT GARMIN NUVI 780 TRAVEL ASSISTANT GARMIN NUVI 850 TRAVEL ASSISTANT GARMIN NUVI 880 TRAVEL ASSISTANT GARMIN NUVI(TM) 260 TRAVEL ASSISTANT GARMIN NUVI® 360 TRAVEL ASSISTANT GARMIN NUVI® 660 TRAVEL ASSISTANT GARMIN NUVI® 670 TRAVEL ASSISTANT GARMIN NUVI® 680 TRAVEL ASSISTANT GARMIN NUVI® TRAVEL ASSISTANT (NUVI® 270; US & EUROPE) GARMIN Quest 2 Portable GPS GARMIN Rino 130 2-Way Radio with GPS/FRS/GMRS GARMIN Rino Series 120 2-Pack Bundle With MetroGuide® CD GARMIN Rino Series 120 GPS/2-Way Radio GARMIN RINO® 530 2-WAY RADIO WITH GPS/FRS/GMRS GARMIN StreetPilot 7200 GPS Receiver GARMIN Zumo GPS Receiver GRMIN NUVI™ TRAVEL ASSISTANT (NUVI™ 200; US ONLY) LOWRANCE GLOBALMAP 5200C LOWRANCE GLOBALMAP 5300C IGPS LOWRANCE GLOBALMAP 7200C LOWRANCE GLOBALMAP 8200C LOWRANCE GLOBALMAP 9200C LOWRANCE GLOBALMAP BAJA 540C LOWRANCE GLOBALMAP BAJA 840C LOWRANCE iFINDER ExpeditionC LOWRANCE iFINDER Handheld GPS LOWRANCE iFINDER Handheld GPS LOWRANCE IFINDER HUNT(TM) C HANDHELD GPS RECEIVER LOWRANCE IFINDER HUNT(TM) HANDHELD GPS RECEIVER LOWRANCE IFINDER® EXPEDITION™ C (PLUS) LOWRANCE XOG(TM) TURN-BY-TURN MULTIPURPOSE GPS RECEIVER UNIDEN 3.5 GPS UNIT UNIDEN 3.5 GPS UNIT WITH BLUETOOTH CELLLINK UNIDEN 4.3 GPS UNIT UNIDEN 4.3 GPS UNIT WITH BLUETOOTH CELLLINK UNIDEN 4.3 GPS UNIT WITH BLUETOOTH CELLLINK & TRAFFIC UPDATES UNIDEN 4.3 GPS UNIT WITH INTEGRATED RADAR UNIDEN MAPTRAX GPS352 UNIDEN MAPTRAX GPS402 Garmin GPS Guide for BeginnersUsing a Garmin GPS with Paper Maps GPS Unit - Price ranges depending on features and functionsGPS Service - There are no subscription fees or setup charges to use GPS How accurate is GPS?Today's GPS receivers are extremely accurate, thanks to their parallel multi-channel design. Certain atmospheric factors and other sources of error can affect the accuracy of GPS receivers. What can cause GPS signal errors?There are several factors that can degrade the GPS signal and thus affect accuracy: 1. Ionosphere and troposhpere (atmosphere) delays 2. Signal reflections off buildings and rocks before it reaches receiver 3. Satellite position reporting errors 4. Poor satellite visibility Do I have to subscribe to a service to use my GPS?No, the GPS satellites are owned by the United States Department of Defense and have been funded by U.S. taxpayers' dollars. Reception of satellite signals is free to anyone. Specific Garmin Unit FAQ'sClick here  Garmin Software Updates and DownloadsGarmin User ManualsGarmin Product Registration 2D Operating ModeA two-dimensional GPS position fix that includes only horizontal coordinates (no GPS elevation). 3D Operating ModeA three-dimensional GPS position fix that includes horizontal coordinates, plus elevation. CDMACode Division Multiple Access - A method whereby many radios use the same frequency, but each one has a unique code. Coarse / Acquisition CodeThe standard positioning signal the GPS satellite transmits to the civilian user. Differential GPSAn extension of the GPS system that uses land-based radio beacons to transmit position corrections to GPS receivers. DownlinkA transmission path for the communication of signals and data from a communications satellite or other space vehicle to the earth Geographic Information SystemA computer system or software capable of assembling, storing, manipulating, and displaying geographically referenced information (i.e., data identified according to their location). L BandThe radio frequencies that extend from 390 MHz to 1550 MHz. LAASLocal Area Augmentation System - The implementation of ground-based DGPS to support aircraft landings in a local area (20-mile range). LORANLoran, which stands for LOng RAnge Navigation, is a grid of radio waves in many areas of the globe that allows accurate position plotting. NAVSTARThe official U.S. Government name given to the GPS satellite system. NAVSTAR is an acronym for NAVigation Satellite Timing and Ranging. NMEANational Marine Electronics Association - A U.S. standards committee that defines data message structure, contents, and protocols to allow the GPS receiver to communicate with other pieces of electronic equipment aboard ships. P CodeThe precise code of the GPS signal typically used only by the U.S. military. RS-232A serial input/output standard that allows for compatibility between data communication equipment made by various manufacturers. TriangulationA method of determining the location of an unknown point, as in GPS navigation, by using the laws of plane trigonometry. WAASWide Area Augmentation System is a system of satellites and 25 ground reference stations that provide GPS signal corrections, giving you better position accuracy.  Filed under: GPS In a move that we can only hope signals a trend, GPS maker Navigon has announced that real-time traffic updates will now be free for all users of its wares. For awhile now, the outfit has offered gratis traffic updates on its higher-end models, but now, it's taking the Free Real-Time Traffic Updates for Life program to each navigation system it produces. There's no extra hardware to buy, no hidden fees -- just good, clean, free traffic updates. What's not to love?Read | Permalink | Email this | CommentsAuthor: Darren Murph Posted: 28 Aug 2008 at 9:46am Filed under: GPS We got a brief glimpse at Garmin's new nüvi navigators, the 7x5 Series and 2x5 Series. Since we weren't on the road, the 755T treated us to 3D views of the IFA building we were chilling at, spinning at a blistering 10 fps. The Lane Assist also does what it says on the box, giving you a crystal clear look at your next merge. The 265T was considerably less dramatic, and both units show a considerable amount of boredom on the industrial design front. Garmin clearly knows what it's about when it comes to navigation devices, but we could use a bit more spice with those maps to keep us coming back. Gallery: Garmin's new nuvi 7x5 and 2x5 navigators live and in person Permalink | Email this | CommentsAuthor: Paul Miller Posted: 27 Aug 2008 at 8:50pm Filed under: Cellphones, GPS, Handhelds Oh, Nuvifone, how you disappoint us. Over here at IFA we just managed to get a Garmin rep to whip out his Nuvifone prototype for a quick look, but sadly, almost a year after the device was first announced, there really wasn't anything new to see. We still aren't allowed to take video of the interface, or really see much of the phone other than the home screen, and when the rep tried to show us how the Nuvifone kicks the iPhone's ass in navigation, the Nuvi promptly crashed -- so at least those two have that in common. Not that we should be surprised, Garmin mentioned last month that the phone had been delayed into 2009, but we're quickly running out of patience, as well as any scrap of remaining hope for this thing to actually matter when it does arrive. Peep the gallery for a little bit of iPhone 3G versus action. Gallery: Garmin's Nuvifone teases its way through another trade show Permalink | Email this | CommentsAuthor: Paul Miller Posted: 27 Aug 2008 at 7:50pm Filed under: GPS Sony's Nav-U line of PNDs hasn't made big waves in the States yet, but the company's keeping at it, releasing four new touchscreen navs today. The new $400 NV-U94T (pictured) takes over from the NV-U83T at the high end, featuring a 4.8-inch touch screen in a 30 percent thinner case, gesture commands, POSITION plus accelerometer and barometer (wild)-based dead reckoning in case of signal loss, Quick Links POI icons, and an RDS-TMC traffic receiver built into the cradle, as well as basic PMP functions, Bluetooth with A2DP output and Memory Stick Duo expansion; the $300 NV-U74T is basically the same package minus the PMP features and with a 4.3-inch screen and the $350 NV-U84 keeps the 4.8-inch panel but doesn't have Bluetooth, dead reckonings, or traffic. There's also a totally new 3.5-inch unit, the $250 NV-U44, which is pretty basic but seems like a fine deal: text-to-speech nav, maps of the US and Canada, and split-screen 3D views with lane guidance. All four should be out in September. [Via CNET]Read | Permalink | Email this | Comments Author: Nilay Patel Posted: 27 Aug 2008 at 5:51pm Filed under: GPS Garmin continued its contribution to the general, incremental advancement of technology today by spitting out a handful of new satnavs destined to be suctioned to your windshield in the very near future. The company introduced updates to its low-end 2x5 series, including the 265T, 265WT and 275T. The models include lifetime traffic alerts via NAVTEQ Traffic, Bluetooth connectivity, and are offered in 3.5-inch or 4.3-inch touchscreen iterations. Garmin also updated its higher-end 7x5 lineup, bringing the 755T, 765T, and 775T into the mix. The devices sport 4.3-inch touchscreens, those same NAVTEQ Traffic updates, 3D transparent building views, accelerated graphics rendering, and HotFix (which stores "critical satellite information"). No word yet on release date or pricing for the new models, though we expect to see them on display at IFA. [Thanks, Tim] Read - Garmin Expands Affordable nüvi 2x5 Series, Offering Hands-Free Calling and Lifetime Traffic Alerts Read - Garmin Introduces nüvi 7x5 Series with Lane Assist, Giving Drivers a Clear Picture of the Road AheadPermalink | Email this | Comments Author: Joshua Topolsky Posted: 27 Aug 2008 at 1:52pm Filed under: GPS Navigon has just dropped it's latest satnav baby on us -- the 7200T -- and it comes with an extra side of slick... like, gooey slick. Upping it's game a touch, the device sports a redesigned OS which incorporates real-time traffic updates (free of charge over FM via Clear Channel's Total Traffic Network) as well as "Reality View Pro" and "Landmark View 3D," the former designed to whip up some photo-realistic 3D signage when you need to make a move, and the latter aimed at helping you notice the little things in life... like the Chrysler building. The unit features a 4.3-inch, 16:9 touchscreen display, 2GB of flash storage, a SiRF GRF3i+ GPS chip, microSD card support, 64MB of RAM, and it all runs atop a Centrality Titan I 600MHz CPU. The 7200T is slated for an October release, and will clock in at $449.Permalink | Email this | Comments Author: Joshua Topolsky Posted: 26 Aug 2008 at 1:48pm Filed under: GPS, Portable Audio, Portable Video Cowon's sexy little S9 Curve PMP isn't the only device we'll see out of the company at IFA this year -- there's also the L3 nav unit and the O2 PMP. The O2 isn't quite as much of a beast as the S9, but it'll more than hold its own with a 4.3-inch touch screen, a T-DMB tuner, TV-out, and SD expansion, while the L3 nav has a 7-inch 800 x 480 touch screen, SiRF III GPS chip, hidden touch controls, a T-DMB tuner, and an FM transmitter. Well get a closer look at these when IFA starts later this week, but expect minor tweaks if these ever make it out of Korea. [Via CNET Asia] Read - L3 Read - O2Permalink | Email this | Comments Author: Nilay Patel Posted: 25 Aug 2008 at 3:23pm Filed under: GPS Though not quite as bad as toting the GPS module around with you, one particular marijuana farmer had to be mighty embarrassed / wondering what he ever did to deserve such bad luck when a GPS-equipped turtle meandered into his crop. As the story goes, a close friend of the police -- a box turtle with no fear of Big Brother -- just happened upon a pot stash on US park property. Clearly, Mr. Isiah Johnson (the culprit) was heavily stoned when choosing US land to farm his ganja, and now he's in custody until he's "extradited back DC to face drug charges." And you thought all you had to do was dodge those CCTV cameras...[Via TechDigest]Read | Permalink | Email this | Comments Author: Darren Murph Posted: 23 Aug 2008 at 4:18pm Filed under: GPS Call it a hunch, but we'd say TomTom is gearing up to have some real fun at IFA. With the PRO 4000 / PRO 8000 units being outed yesterday and this newfangled GO 940 LIVE surfacing today (930 pictured), we get the feeling it's planning a Garmin-esque onslaught here in just a few days. Nevertheless, a pre-order page up at Handtec shows off this all new navigation system, yet completely fails at delivering any pertinent information outside of a price. And given that said price is pegged at £468.83 ($871), you probably couldn't care less.[Via GPSLodge]Read | Permalink | Email this | Comments Author: Darren Murph Posted: 22 Aug 2008 at 3:57pm Filed under: GPS TomTom's new "PRO" series of GPS units, the PRO 4000 and PRO 8000 aren't that different than your regular old amateur nav slab, only these have the PRO moniker, which means they're supposed to be taken oh-so-much more seriously by your corporate masters when expensed. The $330 and $460 units include perks for the "mobile workforce" like a premium ruggedized sleeve, dedicated phone support line, two year warranty and a PIN lock. Both units sport 4.3-inch widescreen displays, with the 8000 (pictured) adding on IQ Routes, Advanced Lane Guidance, Voice Address Input and Bluetooth. Neither one will do your crappy job for you.[Via NaviGadget]Read | Permalink | Email this | Comments Author: Paul Miller Posted: 21 Aug 2008 at 2:29pm Filed under: GPS, Portable Video We're (so) looking forward to the day when we Americans don't have to look longingly at the amazing navigation units that pop up every month or so in South Korea, but until that fateful day arrives, we'll continue drooling courtesy of the Easycar U7. This screen-dominated conglomerate features a 7-inch LCD, DMB TV tuner, 19-millimeter thick frame and an integrated multimedia player / text viewer. All that for just ?199,000 ($191)? Nah, we're not envious at all. [Via Techie Diva]Read | Permalink | Email this | Comments Author: Darren Murph Posted: 18 Aug 2008 at 1:36pm Filed under: GPS Dying to get your eyes and fingers all over Mio's GPS-incarnation of KITT? Can't hardly wait to hear the voice of the voice of the original KITT barking directions at you? Well you're in luck, friend. Radio Shack has apparently begun taking pre-orders for the Knight Rider-branded satnav, which they claim will be available to own come September 24th. Ready to go? Get your credit card out, then prepare to be $269.99 lighter and 40 percent nerdier. [Thanks, Jason]Read | Permalink | Email this | Comments Author: Joshua Topolsky Posted: 18 Aug 2008 at 4:26am Filed under: GPS Built-in breathalyzers haven't become quite the mainstay that many other features have in GPS units, but it looks like they're starting to become a bit more common, with AVMap only the latest to debut a navigator that promises to tell you if you're fit to drive or not. Apparently, its new Geosat 6 Drive Safe navigator is a standalone version of the built-in option that was available on Peugot's 107 "Sweet Years" edition car, with it boasting the same 4.8-inch touchscreen, built-in Bluetooth, and text-to-speech features as before. No word on a price just yet, unfortunately, and it seems safe to assume that this one will only be available in Europe. [Via Coolest Gadgets] Read | Permalink | Email this | Comments Author: Donald Melanson Posted: 15 Aug 2008 at 6:19pm Filed under: GPS It's no secret that the police have been using GPS to track cars for some time now, often without a warrant or court order and, as The Washington Post now reports, it looks like the practice is only getting more and more commonplace. That is mostly due to the fact that courts usually side with the police in the resulting cases that arise out of the use of GPS trackers, with them agreeing with the argument that it is essentially no different than having an officer physically track a car themselves. They also cite a 1983 Supreme Court case that allowed the use of "beepers" that relay a car's location to police. Of course, others, like attorney Chris Leibig, have an entirely different opinion, saying that, "tracking a person everywhere they go and keeping a computer record of it for days and days without that person knowing is a completely different type of intrusion." Given that at least some state courts, like Washington state, side with that position and require a warrant for GPS trackers to be used, it would seem likely that this matter could eventually wind up being decided in the Supreme Court as well. [Via Slashdot] Read | Permalink | Email this | Comments Author: Donald Melanson Posted: 14 Aug 2008 at 5:02pm Filed under: GPS There's nothing wrong with Alpine's new $550 PND-K3 Portable Navigation System, which was first unveiled at CES this January, there just isn't anything too stand-out either. The unit runs a 4.3-inch screen, sports maps of North America and related islands, includes a 3D view and 6 million points of interest, vocalizes turn-by-turn directions and street names, does Bluetooth hands-free and has moderate MP3 and WMA capabilities off its SD card slot. The "big" feature here is menu and map customization via 8 selectable color schemes, but the lack of live traffic info this price range isn't winning Alpine any points. If you're finding all this appealing, you should be able to pick one up as of today.Read | Permalink | Email this | Comments Author: Paul Miller Posted: 13 Aug 2008 at 12:10am Newsfeed display by CaRP |
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