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    NO 9xx plotting sheets
    From: Lu Abel
    Date: 2014 Jan 24, 09:06 -0800
    There are no large scale charts of the middle of the ocean, so if one is going to keep a reasonably detailed navigation plot (DR, GPS fixes, celestial shots) one needs some sort of plotting sheets.

    A long time ago the US Navy's Hydrographic Office produced a series of charts which were basically blank Mercator charts covering 3 degree intervals of latitude and 3 to 6 degrees of longitude depending on latitude.    For example, NO973 covers the band from 38 deg to 41 deg.   (I'm looking at a NO973 from a celestial course I took in the mid 1980s)

    What's happened to these plotting sheets?   I can't find a source for them despite some fairly extensive web searches.

    More important, what do people use today instead of these charts?  

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