A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2021 Apr 13, 01:28 -0700
Tony Oz you wrote: How do I .............arc.
Tony. I presume you mean the slide. It doesn't matter so long as you start from 0 at the centre. Choose the scale to fit speed range you wish to cover . Use the slide slide size you want as a mask to cut out the range you need from your diagram. Dave P