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    Re: Personal Equation and Index Error
    From: David C
    Date: 2016 Dec 20, 23:10 -0800

    Measuring index error should be done with a scope. The higher the power the better. The range  differences shouldn't be more than 0.4' for a set. Your 0 to 2' range of index error is too much and indicates that something is wrong.

    Practicing cellnav is an iterative process. Get something to a reasonable standard and then move on to other things. Then go back and improve the processes.

    When I started taking sights my sextant had a large side error. I eliminated most of it but did not spend time getting rid of it completely because  there were other things I was trying to get right. Maybe now is the time to work on side/index error again. Something to do in the hours when the sun's altitude is greater than 60°.

    I suspect that I am sometimes careless when measuring IE - I do not read the vernier as carefully as I should because I perceive that I am wasting "sun time". I would rather be taking sights. But of course accurately measuring IE is as important as taking accurate sights.

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