Slide Rule Targeting Series

[Pisces]

Originally Posted by derstosstrupp

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One question on the alternative method at the end to using a chord line. When you plot the second line at the end of the first perpendicular line, is that second line drawn using the newly established course? And is the length the same as the first, I.e. also equal to turn radius?

I had a feeling I wouldn't be that clear to understand on that part. No, it is the end of turn radius of the turn circle. The new course is perpendicular to that. And yes, same radius length.

Old course track.
Point of start of turn.
Perpendicular line as radius of turn circle to the turn center.
From turn center a line outwards to the end of the turn, rotated relative from the start of the turn by the turn angle.
From end of turn radius a line perpendicular to it as the new course.

This turn circle plot leaves a bit room for error with non-constant rudder deflections and turn rates, or speed changes in the turn. But should work well enough for government work.

Though I must say, still not done this in a multiplayer session with other crew. I perish the thought of a captain that cannot make up his/her mind as to what course to hold.