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Originally Posted by Rosencrantz
To mooncat:
But you don't know target's exact course fm long distance, right? So how do you find the proper parallel course?
-RC-
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I think I can answer that. Put your bow right on the target, and increase speed to full (no need to go flank at this point). Wait a while, and see which way he drifts, port or starboard. Don't get too close though. Reduce speed if necessary.
For example, if are heading due East when he is on your bow, then he drifts a bit to starboard, he is heading somewhat South. Contrarily, if he drifts to port to there is a northern component to his heading. If he stays directly on your bow after several minutes, you are either on the same or the reciprocal course.
Lets say that after a few minutes he drifts 10 degrees to port. Swing your bow 20 degrees port, then see what happens. Adjust course and speed as necessary.
Once you get close enough, you can get the course by taking two marks on him (separated by three and a quarter minutes to get speed), from them you can get the exact course, and plan accordingly.