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    Re: GPS jamming concerns
    From: Robert Wyatt
    Date: 2016 Aug 11, 14:29 -0500
    Meanwhile, it doesn't matter how good your GPS, pilot, or charts are if the underlying data is just plain wrong:

    Coast Guard cites chart inaccuracy in grounding of icebreaker Fennica


    Bob Goethe wrote:

    There are several aspects to your post, and I don't doubt that you are fundamentally right, Frank, but...

              >>Calder wrote those words at least 15 years ago<<

    ...the copyright on the second edition that I have before me is 2012.  But assuming you are right that the charts that can be had today are all sync'ed with WGS 84, what are the various hypotheses we should entertain for why the entire BVI island group's charted position is offset 100 m north of their GPS position?  It at least *looks* like the chartmaker is using a different reference system for assigning latitude and longitude.


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