NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Gary LaPook
Date: 2011 May 16, 15:04 -0700
As an experiment, as long as you are going to do the calculations and plotting for 4 minute intervals anyway, after you have drawn those graphs then draw straight lines between data points that are twenty minutes apart to judge how much accuracy might be sacrificed by only doing the computations for 20 minute intervals. If there is not too much accuracy lost then you may think of doing that way in the future, a lot less work. The twenty minute interval was standard procedure for flight navigation where a lower level of accuracy was acceptable.
gl
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