For use on land and sea, the Garmin Descent G1 dive computer offers the best of both worlds.
 
Compact and easy to wear the Descent G1 supports a range of dive modes including recreational, technical, and free diving.  Rated to 100 metres this is a rugged  computer with high-contrast display and superb battery life - giving up to 25 hours in dive mode.
 
Features include multiple dive modes and multiple gas dives, surface GPS to mark entry and exit points, and dive log for up to 200 dives.
 
The Garmin Descent G1 is also the ideal sports watch with more than 30 pre-loaded apps for activities including running, swimming, cycling, rowing, golfing, and more.
 
Also available in a Solar option which charges the computer battery while you're on the go.