I'm not very familiar with target course plotting (but want to learn it). so my beginners thoughts are to plot the target's course the following way:
1) reading the absolute position of my sub from the nav map.
2) finding range and bearing of the target, relative to my position.
3) knowing 1) and 2) I can easily calculate the absolute position of the target and plot it into the nav-map.
4) doing the procedure 1) - 3) at least two times allows me to find the course and speed of the target.
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