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    Index Error and Micrometer Drums
    From: Greg Rudzinski
    Date: 2011 Jan 3, 16:23 -0800

    The recent ex-meridian/ LOP exercise which had all my LOP's away from GPS had me back out taking Sun lines to investigate a possible explanation. What I discovered was the bad habit of heavy fingers on the micrometer drum during the index error zero process. My advice to all is to use light fingers when operating the micrometer drum (especially for plastic sextants). Sometimes this is easier said than done when conditions are windy and the deck is tossing. The next best thing to do is to preset the sextant to a close altitude and let the body set or rise to the horizon.

    Greg Rudzinski
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