Who use GPS?
GPS is usable everywhere, except at places where it is impossible to receive the signals, for example inside most buildings, caves, other subterranean locations, and underwater. The most common airborne applications are for navigation by general aviation and commercial aircrafts. At sea, GPS is also used for navigation by recreational boaters, commercial fishermen, and professional mariners. Land-based applications are more diverse. The scientific community uses GPS for its precise timing capability and position information. Recreational uses of GPS are almost as varied as the number of recreational sports available. GPS is popular among hikers, hunters, snowmobilers, mountain bikers, and cross-country skiers, just to name a few. It is used by anyone who needs to keep track of where he or she is, needs to find his or her way to a specified location, or needs to know what direction and how fast he or she is travelling. GPS is now common in cars as well. Some basic systems provide emerge
