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Originally Posted by Nisgeis
There's only one thing I can add to that Munchausen and that's you could try using the plot navigation course tool to plot your course beyond the target's track. That way you will be able to measure from that, instead of having to draw it.
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I did that yesterday when demonstrating the technique to my daughter's boyfriend. Using the "plot course" tool, the trick is to let your sub turn until rudder is centered ... then you can draw your "hypothetical" triangle and get the offset (lead) angle without even measuring your own course ('cause the tool's line
is your sub's course line). You can even continue to close on the target's track ... just so long as you don't change course.
This is certainly the way to go if your TDC is broken ... or you're the skipper of a WWI U-Boat.