NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Örjan Sandström
Date: 2013 Dec 30, 06:45 -0800
with artificial horizon the best you get is less than how accurate the horizon is levelled, for you that is 1 degree.
try the "plumbob trick".
if you look at the mirror like in the attached image you can see if the image of the top of the line is "in line" with the image of the top, any motion up by right or left edge is clearly evident, level as best you can then move 90 degrees (both you and plum) and repeat from beginning.
a piece of advice for good result, attach the line to a tripod, that done and with thin string and fairly windless conditions you can get under 1' fairly quick.
if wind swings the plumbob, set it in a bucket of water (or a cup of molasses) that dampens it fairly well
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