A GPS (Global Positioning System) unit has the primary function of calculating its own location on land or water by using satellite signals. Once the GPS unit knows its own location, it can help the user determine direction and distance to other known locations. For instance, a GPS on a boat can tell the captain how far it is to the shoreline or how far it is to a favorite fishing spot. For the outdoor sportsman a GPS can help with finding your campsite, your vehicle or your next geocache. Popular outdoor activities such as hiking, hunting, fishing, trail running, backpacking, rock climbing, canyoneering and canoeing are all made more enjoyable and safer when you take along your GPS.

The advantage to a portable GPS, besides actually helping you find your location, is that it is small enough to not be a bothersome bit of luggage when you leave for camping trips. Instead of worrying about finding extra cargo space for your enormous GPS contraption, you simply slip the GPS in your pocket until it is needed. When buying a GPS system the first thing to consider is how you intend to use it. If you plan on using it while on foot, you'll want a GPS that is lightweight, compact, weather resistant and that is equipped with features important to foot travel.

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