If you are looking for a really useful tool that is not a computer but is uploadable, records your dive information, provides you with information (time, depth, stop time, temp) and can be worn on your wrist, check out the Suunto D3.
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I have the mosquito for about 3 years. It hanged on one of my dives a few months ago, and since then I heard from various divers that the Mosquito isn't as reliable as a Stinger (never heard anything before, probably because I wasn't paying attention).cancun mark:Actually, I dont think the Gekko is watch sized, it is a little larger. Sunto do make some watch sized dive computers though, the Mosquito and the stinger are the models you might want to check out