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    Re: We need a backup to GPS
    From: Brian Walton
    Date: 2019 Jul 20, 22:08 -0700

    Hi,

       GPS already has a back-up built in.

        If the problem is loss of signal, or spoofed signal, don’t switch it off. Do CN.

        Enter best position as start point.  Enter almanac GHA/Dec as destination, and get miles.  Divide by 60, get degrees, divide remainer by 60 to get minutes.  Take away from 90°:  there’s your Hc.

    Brian Walton

       
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