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    Re: Chart scales
    From: John Brown
    Date: 2011 Nov 1, 13:42 -0700

    Only three inches to a degree of latitude is a very small scale for plotting LOPs.
    Plotting sheets are extremely simple to construct, with any scale you chose.

    As merchant ship navigators, pre-GPS, we were in the habit of making re-usable plotting sheets on the back of UK Admiralty charts, with a fixed longitude scale and the latitude scale measured along a pencil line intersecting meridians at an angle to the horizontal equal to the latitude.

    No need to bother with a compass rose using parallel rules or navigational protractors. The whole thing took a couple of minutes to make and was no less accurate in use than the published versions.

    John


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