[Leoz]

Occasionally when you spot a target for the first time and it is coming straight at you or 10 or 15 AOB there of, you can use an easy method to determine the target's true course.

If it is for example daytime and you may have to submerge soon or get spotted,...submerge and go to periscope depth.

Try to cross the path of the target to where you are visually seeing it at 0 angle on the bow (the bow pointed directly at you).

Then on the F5 map... plot that bearing. The opposite of that bearing is the targets true course.

Now, at your own time, without being rushed, you can go off to the side of that target track and get accurate position plots based on bearing alone and thus put a stopwatch against it and determine the target speed.

One author described this was how Lemp did the SS Athena.

I have used this many times in the game as it is low-workload and easy.