On Mon, Sep 08, 2014 at 01:47:57PM -0500, Bill Gee wrote:
> The starting point is two azimuth readings. Call them FOR1 and BACK1.
>
> 1) FOR2 = BACK1 + 180
> 2) FOR2 = FOR2 MOD 360.0
> 3) If (FOR1 - FOR2) > 180 then FOR2 = FOR2 + 360.0
> 4) FINAL = ((FOR1 + FOR2) / 2) MOD 360.0)
For 1 and 179, t
This is a classic problem, and since I ran foul of it in my own cave
data processing software ( http://wscc.darkgem.com/caveconverter/ ) I
have heard of two other cases of cave survey software falling into the
same trap. The answer is to treat the bearings as vector forces and
average the vectors.
