Didn't think about it, I usually don't TC when I am under the sea. Good point.
Anyway if you want to be realistic, use your little sonar to ping under the keel, you will get an estimate but you will tell everyone out there you're around :-)
I would prefer the icon to be removed actually. On top of that you have the different blue colors on your map that tells you if the sea is deep or not. That's not a big help cause there is maybe 3 different blue only, light blue are usually deeper than dark blue if I remember.
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