Keep in mind that the bearing is not enough. That ship is going somewhere, so you need to determine his heading and his speed in order to set up an attack. Then you can either:
A. Point the periscope in the direction you wish to go and press the = key (this is called course to view).
B. Use the chart tools to lay out new waypoints or move the old ones to where you want to go.
It would have been nice of them to include an exact heading you could type in, but they didn't.
