GPS (Global Positioning System) monitors have a multitude of legitimate uses, but they have also provoked controversy and yet they diminish privacy. Some customers of car rental companies have complained that their movements were monitored without their consent by the installation of GPS vehicle tracking systems in rental vehicles. However, the positive uses of this technology have, at least so far outweigh the negatives.

Fitness enthusiasts use GPS Tracking devices to measure distances remaining in marathons, and back-country hikers use to prevent getting lost (or facilitate rescue if they already are). Police can enforce restraining orders and parole conditions by stopping criminals from stalking victims and being in neighborhoods (such as playgrounds nearby) where they are banned. Lost and stolen vehicles can be located by simply pressing a button. Parents can use GPS vehicle tracking to check the driving habits of teenagers to ensure that these inexperienced drivers are not speeding or otherwise endangering themselves and their passengers. And GPS in-car navigation systems can guide drivers through unfamiliar terrain to their destination.
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