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Hi folks,

I've enjoyed lurking on this group and learning more about old-time
navigation in this electronics-obsessed age. GPS is wonderful but we
still take sextant sights about our sailboat while at sea, for practice
and fun.

Wolfgang K�berer in his interesting post about the NMM said something
in passing about determining position by variation. That sort of
boggles my mind as variation - especially off the US East coast -
changes slowly with distance. How does this work? And, how, especially
long ago, did mariners determine variation with any sort of precision?

Thanks much,
Jack Ganssle


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