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The original GPS system was invented and put together by the US Military. Orginally, it required huge radio receivers, big power supplies, and substantial antennas.

With the miniaturization of electronic parts and computer chips, GPS receivers were invented that put the power supply (batteries) and the radio receiver in a backpack. The antenna became easier to carry, and looked like a saucer on top of a pole.

Today, all of the above are so small that they can be put in a tiny space . . . battery, antenna and receiver. This is a 'Stand-alone' GPS receiver . . . it works all by itself and needs no other equipment.

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