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post #6 of Old 11-12-2012
Hudsonian
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Re: Now Blow (how to adjust compass) Me Down

Regarding your question, "How do you know if your compass is accurate in the 1st place?" A highly reputed compass adjuster told me that he established true north by the sun and an almanac. I believe this this discussed in American Practical Navigator (H.O. Pub. No. 9). US Government Printing Office : Washington, DC, 1966 As I recall he would develop the magnetic north through the use of a variation chart http://msi.nga.mil/MSISiteContent/St...s/mv-world.jpg
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