I hate those multiple choice questions!

[Miltiades]

Originally Posted by Sailor Steve

At one point I wished there was a choice for 'Crash Dive', at least for aircraft sightings, but then I remembered that I might be in shallow water when that happened. I leave it at 'Do Nothing' just because it might be a merchant I want to stalk on the surface.

Isn't crashed dive set to 50-70m?
I don't know where your hunting but that's really shallow waters