What practical things would a handheld GPS unit be useful for?
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How is GPS used?\n\nGPS receivers collect signals from satellites in view. They display the user's position, velocity, and time, as needed for their marine, terrestrial, or aeronautical applications. Some display additional data, such as distance and bearing to selected waypoints or digital charts.\n\nBack to top\n\n\n--------------------------------------------------------------------------------\n\nWho uses GPS?\n\nGPS is used to support land, sea, and airborne navigation, surveying, Geophysical exploration, mapping and geodesy, vehicle location systems, and a wide variety of additional applications.
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User Guide for the Zire™ 31 Handheld
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Go to www.garmin.com...they have GPS systems for all kinds of activities. I am a runner and use a wristwatch model to track my mileage, time and heart rate. Prices are variable considering your needs...
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GPS is short for global positioning system. GPS devices tell you your exact longitude and latitude. GPS is a satellite-based radio navigation system developed and operated by the US Department of Defense (DOD).\nThe US military refers to it as NAVSTAR GPS. This is a satellite navigation system used for determining one's precise location and providing a highly accurate time reference almost anywhere on Earth or in Earth orbit. It uses an intermediate circular orbit (ICO) satellite constellation of at least 24 satellites.
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Any consumer electronic device containing microchips relies on quantum physics for the diodes and transistors on the chips to work.   The laser in a CD player relies on quantum physics for its operation.   The Global Positioning System depends on very precise timing of satellite radio signals.   A special relativity correction is applied to allow for the motion of the satellite relative to you, and a general relativity correction because you are deeper in the Earth's gravitational potential well than the satellite.   Time passes at a different rate for the satellite than for us.   If these corrections were switched off, your GPS navigator would become less accurate.
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Can you elaborate a bit more on the requirements and / or expected functionality of the "point of service system"?
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make any sensing devices, which has the altest features. u can get a lot abt them on internet and modify them for the latest demands
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Google earth works really well...just have to download it....but it wont be in real time everytime you use it..it sounds like you want it for security purposes...that I guess you would need a keyhole satellite for!!!
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Your GPS antenna needs to be able to see the sky.  Try pointing it out a window.  Besides, you don't really need to know where you are at home, do you?
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i have a Garmin Map 76. good sized screen, excellent detail and under 200.00. full of features and easy to use. Also very water resistant and tough case. I live In British Columbia Canada and all i do for recreation is outdoors.
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All GPS can tell you is your location on the earth. GPS cannot tell you where your property corners are, unless you already know the coordinates of those property corners. Your GPS unit does not know where your property corners are until you provide it with the information it needs. \n\nIf you knew the coordinates, which could be either latitude and longitude that mappers use, or state plane coordinates that surveyors use, then you could use GPS to guide you to the corner locations. But since you do not know where the corners are, you have no way of entering the required data into the GPS unit. \n\nYou not only need to get a professional surveyor to survey your property, you also need to tell the surveyor that you need him to provide you with the state plane coordinates of those points, so you can enter them into your GPS unit, then you will be able to find them yourself in the future.
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This sytem was in place before GPS it was called Loran it was not as accurate. Really good thinking though Barbie, you are going places. Let me add that a system is in place now to locate cell phones in exactly the way you propose for emergency situations. However I believe in the future cell phones will incorporate conventional gps, as in an eperb and also for the user as location info.
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What is this device? what does it do? we need more info to answer here.
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Hi there...I find desktop widgets extremely helpful.  I rely heavily on many such as  iSend to send text messages to employees cell phones, Local city government widgets to monitor local road and ferry commuter traffic, Gas Price Watch to locate the least expensive fuel wherever I'm located and Duo Core Temp to monitor my Macbook Pro's internal temp.
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I like using Google Earth to get Lat/Long info. Just take it to where you want to go, and the coordinates are in the lower left corner. Free download, and hours of nerdy entertainment.
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Ida know...  My GPS doesn't always take the right route...
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I own a Garmin iQue 3600 which is a PDA, where I can store all my contacts, documents like spreadsheets and word files, and has a built in GPS system.\n\nWith the mapsets that come with it, you can navigate anywhere in North America.... as I'm driving down the street, it actually tells me what address I am passing!\n\nI purchased Intelligolf Eagle Edition, which allows for GPS mapping of golf courses, with many courses already mapped. The device is easy to use, and is very accurate. If you are mapping out your favorite courses, you can map 3 points or objects like bunkers, hazards, trees etc, as well as the 200, 150 and 100 markers and you can even map the front, middle and back of the green.\n\nCourses are free to download or upload, unlike other devices like the SkyCaddie, where you pay an annual subscription.\n\nI paid $382. cdn off Ebay, with 2006 mapset and full warranty(costs $599. U.S. from Garmin site) for the device including all the auto navigation kit, and another $60 cdn for the Intelligolf.... less then the SkyCaddie and course subscriptions.\n\nI threw away all my maps, as I no longer need them.,... I just let the iQue3600 "tell" me where to turn.... yes it talks!\n\nI even typed in "Golden Corral" when I was in Hilton Head, and it told me where to drive to get dinner!\n\nHighly recommended!