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Frank,

The homebrew is the result of how I use a sextant underway. I do not take multiple observations but rather a single careful observation. In this case the circle of error will need a larger value. On checking index error usually 3 or 4 alignments of the horizon or limb to limb Sun will be made and a mental averaging done. This is done before each session of observations to confirm index error. Generally index error ranges are between 0.3' and 0.5'. The same range is expected on the actual observation which doubles the range value because I'm interested in the worst case scenario for positioning safety. If there is a luxury of time then sure a much higher precision can be expected with multiple observations and statistical analysis as you have described.

Greg Rudzinski
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