Garmin Geko 101 Waterproof Hiking GPS (Yellow) Compact 12-channel GPS receiver with high-contrast display (100 x 64 pixels) Stores 250 waypoints Waterproof: submersible for 30 minutes in one meter of water (IEC 529 IPX7 standards) Easy operation: five buttons for one-hand use 12-hour operation on 2 AAA batteries