Overreliance on GPS Could Be a Deadly Mistake

GPS (Global Positioning System) units have become a must-have item for hikers, campers and boaters. While there's no denying their usefulness, they should never be your sole source of navigation in the backcountry or on the water. If something goes wrong, you'll be directionless and potentially in danger.

GPS Shortcomings
As anyone who's used a GPS knows, the system doesn't offer pinpoint accuracy. Your location could be off by anywhere from 3 to 300 feet. If you're on open terrain or boating in an open area, this may not be a concern, because you'll be able to see your destination. If you're boating at night or in rough seas, the danger increases, because fog, high waves and darkness could put you on a collision course with obstacles or cause you to sail past a safe harbor.

In heavily wooded areas, these small inaccuracies can be a big problem. You can easily miss trails and shelters if you're off by just a few feet. GPS can be a helpful tool when you're outdoors, but it's no substitute for a map and a good knowledge of the area.

GPS Failure
GPS could let you down when you need it most. Satellite signals struggle with atmospheric and environmental conditions. Heavy cloud cover in a storm could be enough to block the signal, on land or on the water. Thick tree cover will also block signals. If you're in the mountains, be aware of the satellite shadows around rocks that could leave you without accurate readings as satellites move in and out of position.

For the greatest accuracy, your GPS needs a clear line of sight between the handheld or mounted receiver and the satellites overhead. Anything that interferes with that line of sight could throw off the accuracy or leave you with no signal at all.

Battery failure is a very real concern for handheld GPS units. Always make sure you've got a full charge on your batteries before you head outdoors. Carry spare batteries for hiking trips, even if you only plan to be out for a few hours. If something goes wrong and you get lost or trapped, you'll need them.

Carry a Compass
It's best to think of GPS as one extremely helpful tool in your navigation arsenal. Always have a mechanical compass with you, whether you're on a boat or in the backcountry, and know how to use it. Bring maps with you and pinpoint your location periodically in case you need to retrace your steps. Finally, let other people know where you're going, when you expect to reach a destination and when you expect to return. Time works against you when you're in dangerous situation outdoors. The sooner people realize you're missing, the sooner help will be on the way.