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Many people can own a portable gps system.  All mobile phones have GPS emitters and they have become the most common portable GPS systems.  Purposes range from using in serious medical emergencies to being used for sports and entertainment.  On vacation, some portable GPS systems have built in cameras that create photos with latitude and longitude of the places where the pictures were taken.  Pets and misplaced valuables can also be tracked easily.  Another means of use is by competitive glider pilots who want to prove that they have reached certain race markers and use the portable GPS system to gather such information.  Many devices can now be equipped with GPS emitters and can be easily tracked.