Amazon.com has a Garmin eTrex GPS with Waterproof Exterior for $85.49 with FREE shipping.
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- Global positioning system (GPS) receiver continuously tracks and uses up to 12 satellites n
- Calculates current and average speed, time of sunrise and sunset, trip distance, and more n
- Automatic track log–10 saved tracks let you retrace your path in both directions n
- Tough waterproof case; runs for 18 hours on 2 AA batteries