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Originally Posted by StarFox
click on that button, it sends out a sonar ping (even if you dont have sonar) and he will tell you what the depth is
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That's because they all have the bottom-checking sonar device (I forget what it's called, and am not in a position to check).
It's a good idea to ping when in shallow water at least once an hour. That way if a convoy (or just a destroyer) shows up you already know, and don't have to risk their hearing you.