New to SH3

[Pisces]

Isn't there a PDF manual in your SilentHunterIII/documentation folder?

I've even figured out that "Ñ" is for stop (the button just to the right of the L).

You apparently have a special country specific keyboard layout. As that symbol isn't part of the usual US-keyboard layout. Not even on the German QWERTZ-layout. The game uses specific key codes to make certain functions happen. Engines All Stop is the Tilde ~ key left of the number 1 on the US layout, and ^ on the German. So the layout will be all over the place on yours I fear. Quite a puzzle.