# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Great Circle Course via calculator & HO 208
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.

```
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