What To Look For
When purchasing a new GPS unit for hiking and outdoor, first weigh the functionality you'll need and the amount you're willing to pay. There are simple, inexpensive units that will provide directions back to a starting point, more advanced units that allow you to store and navigate to a number of waypoints and advanced mapping units that include preloaded or separately-purchased maps that let you see your location and route on a map. There are other characteristics to look for:
High Sensitivity chipset such as SiRF Star III: Provides better satellite signal and increases performance under coverage
WAAS-Enabled: Increases accuracy within North America
Mapping: Look for what maps, if any, are included (i.e. topographic, road maps)
Waterproof: Good protection for use out in the elements
Barometric altimeter: More accurate than GPS-based elevation and can serve as a navigational tool and weather predictor
Battery life: Consider the length of your average trek and be sure to consider battery life
Size versus Weight: Larger devices will be easier to read/use, but smaller units will help shrink your load
Screen lighting: Outdoor use will entail a variety of lighting conditions (bright sun, flat light, night use), so test the screen for visibility under different conditions
Common Pitfalls
Never purchase a GPS unit as a replacement for a map and compass. While a GPS is an excellent tool that can provide an easier interface for hikers and backpackers, it is not reliable in the same way that a map and compass are. Batteries die, electronics fail and GPS units experience difficulty obtaining a signal under heavy tree cover and in canyons. While you may use your GPS as a primary navigation device, you should always carry traditional navigation devices as reliable back-ups.
Where To Buy
Outdoor GPS handhelds are available at a variety of retailers. You can find them at your typical outdoor equipment sources and at general retailers like Wal-Mart. Electronic retailers like Best Buy also stock GPS units. You may opt to shop locally, in order to test the receivers out and compare functions, or you may choose the convenience and price comparisons of Internet shopping.
Cost
Expect to pay anywhere from $80 to $700 for a GPS unit. The wide price range is why it's important to decide on the functions that you actually need. Inexpensive models like the Bushnell Backtrack will just get you back to the trailhead; whereas top-end models like the Garmin Oregon 550 include detailed mapping, touchscreen and even other functions like built-in digital camera.
