[sublynx]

Mark I Eyeball will do nicely. No need to learn the geometrical stuff if it doesn't feel right.

On the other hand the one time I survived until late 1943 I began to feel sorry I had not paid more attention to navigation techniques. The airplanes and radar kept making convoy shadowing quite an effort. If I had known how to calculate approaches exactly I could have minimized the time I had to be surfaced and I could have minimized the risk of being out of position if the convoy made a zigzag. A botched approach with radar and escort carriers around can force one to spend an extra day near the convoy with its airplanes, while surfaced. I'm now trying to learn the techniques that might help me keep my boat from harm's way, if only for a few hours or a day.