Okay this is off subject but thought I'd share . I assume if you were in water deep enough to float that you didn't realize it was that deep until it was too late. I found this on a marine products site and thought it might be awesome for offroading. Basically it's a remote sonar sensor that floats on the water surface and transmits the depth back to the watch. Normally intended to be dropped off the side of a fishing boat, but seems like you could tie a small cord to it and then throw it into the center of a puddle. $83 including shipping.
http://www.valencemarine.com/Humminbird-RF35_p_152.html
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