NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2012 Oct 12, 13:49 -0700
Orjan,
I just tried graduating 40 degrees using 57 mm as radius and 10 mm as the 10 degree chord. The result was in error by less than a degree. I like it !
Greg Rudzinski
[NavList] Re: Angles without a protractor
From: Örjan Sandström
Date: 12 Oct 2012 13:20
if one uses the rule that on a circle with radius 573 units leads to 1°=10 units
a very accurate result in theory within less than 2', but few can be that accurate without good tools and stable platform...
actually radius should be closer to 57,2957795 units, measuring to half millimetre is hard enough for most on land in a boat, forget to 1/10 or better.
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