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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Great Circle Course via calculator & HO 208
From: Bill B
Date: 2016 Oct 5, 02:26 -0400
From: Bill B
Date: 2016 Oct 5, 02:26 -0400
On 10/5/2016 1:38 AM, Bill B wrote: >> In any event the path connecting ponts 1 degree of longitude at 41N are >> not significantly different fron a great circle path. I'm working hard to understand your frame of reference vs mine. Let's take an extreme example. From 41N I wish to travel to a point diametrically opposed on the other side of the earth on 41N. If I travel along the parallel, it would be 180d in navigation terms, so 180*60*cos 41 in nautical miles. GE and the great circle route would take me over the pole for a distance of 98d, each 60 nautical miles. That would indeed be 98d along a great circle. Therefore a tremendous savings in any unit of distance. My example was 1 degree longitude difference, approx. 75% of 60 nautical miles. That is, for all practical purposes, a rhumb line course. Yes, IF along a great circle route it would close to what you stated in degrees. Perhaps wishful thinking, and it may already exist in GE, but an option to display degrees in rhumb line vs great circle would be nice. Then 86-85 would equal 1, which is my point.
