I learned something today I wasn't aware of. Your declination can change over time. I always thought I was about -4 degrees w. Glad to know that, something else to keep track of.
Also here is another link for finding your declination.
I read something about older FAA maps are wrong because of declination changes at certain airports, something like if you approach by the old headings you miss the runway by 20 feet or something to that effect.
Common sense is so rare these days, it should be re-classified as a super power.
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