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    Re: Longitude by Sunrise example
    From: Jeremy C
    Date: 2010 Feb 4, 15:01 -0800

    The GPS latitude was 16 deg 33.0' North at 1900.

    I think there is some flaw in the method published by Ocean Navigator. He obtained the method from an emergency navigation book and I assume it was for the observer being close to the water. If you follow the link from my original post, you can read his methodology. I suspect that he was mis informed as to when you are to take your reading for sunset. He did say to use the upper limb for sunrise which is the example he offered.

    The upper limb was on the vis horizon at 19:00:48 Local time. This is of course much closer to the calculated time.

    I posted the example here as a comment on their site, so I will see what they have to say.

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