Yes GPS is plugged in and comes on all by itself, it can drain the battery.
Yes
Yes, you need to set up your GPS with a computer first
no
The best non-GPS bike computer on the market is the Wahoo Elemnt Bolt.
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The best GPS cycle computer with maps available on the market is the Garmin Edge 830.
In addition to providing directions, GPS technology can be used for surveillance and safety. The most basic GPS tracking systems allow users to follow the location of a person, car, pet, or anything that moves or is moved. The major components of a GPS tracking system include the actual tracker and the receiver. The receiver is usually plugged into a computer's USB port, and then the history of the tracker's movement can be reviewed. GPS trackers are very affordable and they are similar in size to USB flash drives.
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GPS
A GPS unit bought anywhere will work anywhere, although some words may appear on the display in a language that you don't recognize.
PDA's can come with GPS technology and it works through the same function as other GPS systems, via satellite.