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    Re: Experience of using a hand-held bubble sextant in a light aircraft
    From: Geoffrey Kolbe
    Date: 2019 Sep 30, 22:25 -0700

    Tracy, you said:

    "My sun sight was straight out my left window and the resulting LOP grazes my FMS location by maybe 6nm. I took the moon sight diagonally accross the cockpit through the left windshield, at an angle easily less than 50° through the glass. The resulting LOP is 30 some miles at it 's closest to my FMS."

    This seems to echo my experience, that at times I was feeling pleased that I was getting very acceptable results and then at other times I was well off the mark. Refraction through the cabin windows undoubtedly contributes some error - but the best part of a degree? I think I would need a lot more experience before I could sift out what the real problems were and mitigation strategies for them. But the sextant has an averager for a reason and next time I get the chance I will certainly use it.

    Thanks for your comments

    Geoffrey

       
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