[djmcmath]

That's neat, but ... doesn't it seem a little impractical? I mean, the limits of recreational diving are actually pretty shallow, something like 50m. So if you've got a watch that's rated to 100m, then you're giving yourself a 100% safety factor on top of whatever safety factor the engineers designed in.

A watch with a depth rating in excess of 1000m just seems overkill to me. Why is that a worthwhile expenditure of engineering effort? Does anyone ever make use of that kind of depth?