Hi
Are you surfaced and did you upgrade the hydrophone? The first hydrophone you get should work while surfaced, but can only really detect ships at the sides of the boat, not in front or rear. The upgraded version can detect in all directions, but only works while submerged, as it's sitting on the deck.
I think that there is a command to follow nearest sound contact, through which you don't need anything locked. You just need an available sound source. I'm not sure though if it's available in stock, as I play with TDW's UI.
The compass lines disappearing on low zoom happens to me too, and it's really annoying. Don't know how to solve it.
You can't change through the game menus, but there might be a file you can edit. I don't know. You can check key bindings in game through F1.
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