It's all good, gentlemen
Thank you for your work.
Not only is it useful in game, but also to understand concepts and terminology such as relative bearing.
I also use a technique for setting an intercept course on a radio announced contact. I use the ruler to run their course line forward and another ruler line to that line from my position. Of course I have to ask the navigator to do a fix to get that position. (Using TDW Real Navigation mod)
Then I determine when I and they will reach the crossing point, using an estimate of their speed. To shorten that time I move along their course line, drawing added lines to my point. Each new line changes the distance I must move and so the time to arrive. Eventually I will get an optimum time to contact without needing a ridiculous speed on my part.
Then I set course and speed to reach their location and go hunting.
(The above is open water navigation, just related to what you discussed.)
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