Actually if you're a German U-Boat, your bearing from the target is all that needs to be said because the Germans measured the bearing as 0 to 180 from the starboard or port bow. They'd say the target bears 45º port.
The American bearing system is a 360º system to avoid confusing starboard and port. The German bearing 45º port would be 360-45 or bearing 315º.
That's why I've been caught saying that angle on the bow is nothing more than your bearing from the target using the German system. No graphs necessary.
