Geko 101 features:

Easy operation: five buttons for one-hand use
Weight: only 3.1oz with batteries
Compact size: 1.9" W x 3.9" H x .96" D
High-contrast display: 64 x 100 pixels
Battery life: 12 hours on 2 AAA batteries
Waypoint/Route storage: 250/0
Automatic track storage: 3,000 trackpoints with PanTrack? and TracBack?
Waterproof: submersible for 30 minutes in one meter of water (IEC 529 IPX7 standards)