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    Re: Historical charts and mapping
    From: Robin Stuart
    Date: 2016 Aug 23, 10:18 -0700

    I thought it might be instructive to plot the 1847 position given for the Stonington Lighthouse (41°19'36"N, 71°54'36"W) on the modern chart. The position is marked by the red cross in the attachment. The difference is in the wrong direction to be attributable to the offset between the Greenwich and WGS84 zero meridians http://fer3.com/arc/imgx/greenwich-longitude-offset.pdf

    Robin Stuart



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