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Lu wrote:

> I ran into an immediate shock:  while we of the mariner persuasion call
> the difference between true north and magnetic north "magnetic
> variation," most of the rest of the scientific community calls it
> "magnetic declination."

I'll be interested in the answer. For me it has always been a handy memory
device to differentiate between deviation and variation.  I know the "d"
word used in bushwhacking is the same as the "v" word for mariners.  The
casual bushwhacker has no equivalent of deviation that I am aware
of--although I bet that is about to change. 

Along the same "confuse-a-cat" lines, why do triangular-shaped markers (3
sides) use even numbers, while square markers (4 sides) use odd numbers?

Bill




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