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    Plotting Mercator or Passage Making?
    From: David Pike
    Date: 2016 Feb 28, 13:20 -0800

    A retired Royal Engineer Surveyor and map collector friend of mine is perplexed.  For years he’d always assumed the chart referred to as PM1 stood for Plotting Mercator 1:1,000,000, as indeed I had.  Recently however, he’s found a chart entitled Mercator Passage Making Chart No1 (which is in fact a 1: 2,000,000 chart).  Is this just a case of one group, possibly the aviators, using the same pair of initials for one thing as a different but similar group, possibly the mariners, using the same pair of initials for a slightly different activity, or is there a more fundamental explanation?  What are readers most familiar with?  DaveP



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