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GPS navigation devices have quickly become an indispensible resource for many travelers, as people learn the value of these great GPS systems.  Motorists as well as hikers, cyclists and recreational boaters regularly use GPS tracking systems to ensure they stay on their planned routes and have a fallback plan in the event they wander off course.  Some units  offer the capability of recording the consumer’s movements during a trip, step-by-step, and making this information available for download.  The Global Positioning System (GPS) is a United States space-based radionavigation system which provides reliable positioning, navigation, and timing services to both civilian and military users on a continuous worldwide basis and is offered free for all to use.