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Power of the GPS Unit...Unless you plan to use your GPS receiver in your vehicle, consider batteries and optional power. GPS units require 2 to 4 AA batteries, and they last anywhere from 15-24 hours. Some of the best features (altimeter, compass, illuminated screens, backlit keypads, mapping features) tend to decrease battery life. Use of the battery-save mode (if available) will save on the life of your batteries. If you will use your GPS while driving, you'll want a unit that can operate off a cigarette lighter.
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AGPS case is created from a durable nylon or leather material that should be crush resistant and waterproof because the environment where these devices are normally used can cause many damages. The material should provide the device with protection from abrasions and scratches. A GPS case should also be lightweight for more convenient carrying. They are often equipped with a clear vinyl window in order to use the device without removing the case. Easier access to the battery panel will also be a plus. A GPS case might also have a belt or a backpack for keeping the device safely, securely, and conveniently.
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Most built-in systems need to be professionally installed. They usually fit in the same slot as a car stereo, and they include radio tuners and CD players, so you won't have to do without music. The navigation screens on built-in units typically pop up or slide out, which makes for an interesting conversation piece when friends get in the car, but such units can cover other dashboard controls or air vents.
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Mapping Units:
* These models provide several more features over most basic gps.
* Generally contain pre-loaded points of interest maps or a detailed basemap.
* Allow for downloading more detailed maps including topographic and highly detailed street maps.
* Additional memory can range from 1 megabyte to 20 megabytes.
* Garmin models come with a PC interface cable as part of the package.
* Virtually all of these are 12 parellel channel and some now include WAAS (wide area augmentation system) accuracy. This is a combination of ground and satellite positioning that is still in developement.
* Some of the higher end models also include barometric altimeters and electronic compasses.
* Some manufacturers also produce vehicle mounting brackets for your handheld unit so they can also be used as an automotive unit.
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handheld gps receiver News From Around The World

Write Here, Write Now: And you thought you were overloaded with information now, just wait. Hewlett Packard is working on a technology to let folks print messages in mid-air based on their location incorporating GPS technology. I find this stuff fascinating, even if no one seems to have thought of a good use for it yet. The first sentence of the article is right, though: "The kids are going to love this." in New Scientist via RCPL's Liblog]

When the ALA summer conference was in San Francisco in 1997, the SF Museum of Modern Art had a fascinating exhibit called Icons: Magnets of Meaning. I spent hours browsing through it, but one of the pieces that has always stuck in my mind was called @: Marking the Electrosphere . It talked about the meaning of that one little symbol. How it can define, place, and root you in the world, but at the same time let you be found anywhere. Integrated, widespread use of GPS is going to take this to a whole new level.

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