I've had a Garmin 72 for a few weeks and my dad has used a Garmin 12 for a few years. I just use mine for caching. He uses his for shrimping, hunting, fishing, caching, etc. I have been shrimping and fishing with him and the 12 has worked great! Waves splashing up on the thing and all.
About the water issue. I don't think that the units were meant to be tested by users holding them under water. The reception would be severly compromised... Do you guys navigate under water?? Enough ranting.
kc
row, row, row your boat