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    Re: Anti-spoof app
    From: David C
    Date: 2020 Apr 11, 17:14 -0700

    Recentlt there was a thread about  IE vs IC which I did not follow. Maybe I should have done. I wanted to confirm the sign convention used by the anti-spoof app so I set my phone and tablet side by side. The index error is 4' on the arc which means I have to subtract 4' from sights. I therefore set IC to -4'  but it added 4' to the sight.  I changed IC to +4' and the number was subtracted.

    My interpretation is that IE = +4'  and IC   = -4' but the app thinks otherwise.

    It is fortunate that I have two devices to compare (-;

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