This is a MapHist list message (when you hit 'reply' you're replying to the whole list) o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o +
One would have to have a look and do some minor research, but they sound as though they might be isogonic lines showing magnetic variation (as sailors call it)/deviation as landlubbers have it. S Stephen Davies China State Shipbuilding Corporation Research Fellow, Hong Kong Maritime Museum On 18 Sep 2011 02:22, <[email protected]> wrote: > This is a MapHist list message (when you hit 'reply' you're replying to the whole list) > o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + >
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