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    Re: Susceptibility of GPS to CME, Rationale for CN?
    From: Robert VanderPol II
    Date: 2018 Oct 3, 08:45 -0700

    Greg:

    Have you ever used the table for distance off based on vertical angle between waterline and horizon beyond?  You don't need to know the height of the object, just your own height of eye. Only works well for fairly close objects and ones where the horizon beyond can be seen.

    Bob II

    Re: Susceptibility of GPS to CME, Rationale for CN?
    From: Greg Licfi
    Date: 2018 Oct 3, 07:47 -0700

    . . . . I also use a sextant horizontally, for costal navigation, the other use I use it for on board is distance from a landmark of know height - works well. . . .

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