If you're happiest in the great outdoors, a handheld GPS device may make you even happier. Use a GPS unit to help with your personal navigation needs whether you're boating, hiking, geocaching, or doing any other outdoor activity. The following table offers recommended features to help you choose the right GPS receiver for your purposes:
| Activity | Useful Features in a GPS Device |
|---|---|
| Hiking, mountain biking, cross-country skiing | Altimeter/barometer Electronic compass Sunrise/sunset table Uploadable topographic maps |
| Geocaching | Electronic compass Geocache database Uploadable topographic maps |
| Hunting | Hunting and fishing calendar Sunrise/sunset table Uploadable topographic maps |
| Fishing | Fishing calendar Floats Saltwater tide table Sunrise/sunset table Waterproof |
| Boating (inland and offshore) | External power supply Floats NMEA output (for autopilots) Saltwater tide table Sunrise/sunset table Uploadable nautical charts Waterproof |
| Canoeing, kayaking (inland and coastal) | Floats Saltwater tide table Sunrise/sunset table Uploadable nautical charts and topographic maps Waterproof |
| 4x4ing, motorcycling, ATVing | Electronic compass External power supply Uploadable topographic maps |
| Flying | External power supply Jeppesen database WAAS |
| Mapping, data collection | Area calculation Differential GPS External antenna Helix versus patch antenna Large number of waypoints and tracks WAAS |
| Caving, scuba diving, visiting art museums | Sorry, you're out of luck! You need a clear view of the sky for a GPS receiver to work. |
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Source:http://www.dummies.com/how-to/content/musthave-features-for-a-handheld-gps.html
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