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The GPS navigation signals that are used in GPS technology are important. All of the uses of GPS technology depend on these signals. In fact, with the advances in technology since the first GPS devices were issued to the military, there are more uses for these signals than ever before. This makes the signals even more important than before.

A portable navigation system could be just the thing if you often travel to new places, have map-reading issues, or simply hate asking for directions. Although not as easy to use as the best built-in systems in new cars, portables can be moved from car to car (they weigh between about 5 ounces and 21/2 pounds), and most will easily fit in your luggage. And there’s no monthly fee involved, except for the real-time traffic reports available with some models.

Like built-ins, portables have a map-display screen driven by an internal database. An integral antenna receives Global Positioning System (GPS) information to determine your whereabouts. You pick a destination by entering a cheapest iPod touch or selecting from “Points of Interest” such as restaurants, gas stations, and ATMs, and the device speaks and shows you where to turn. You can program the system to avoid toll roads or freeways, or pick the shortest or fastest route.

We tested 15 portable nav systems, focusing on ease of use and the information provided to the driver. A touch screen, found on most systems. Your fingertip is easier to use than a stylus, needed on the Navmans, Mio, and Pharos. A preloaded, detailed electronic map of the whole U.S. (With the Navman iCN520 and Pharos, you need to load map data segments from a PC into the system’s memory, a tedious job.)

Discount GPS navigation will be received with accuracy, because of the dedication and money that the United States puts into the maintenance of the satellites. The satellites, which are officially known by the government as NAVSTAR GPS, are kept and maintained by the United States Air Force 50th Space Wing Division. It costs about $750 million to maintain the satellites through the year. This maintenance goes for not only maintaining the satellites on track but keeping them working so that they can receive all of the updates that will be needed for GPS technology to be more precise.

Internet reference:

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Editor: Ann