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A mnemonic rhyme I was taught as a teenager (in a region with westerly declination) is Grid to Mag -> Add Mag to Grid -> Rid Doesn't help those with easterly declinations, of course (...
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A mnemonic rhyme I was taught as a teenager (in a region with westerly declination) is Grid to Mag -> Add Mag to Grid -> Rid Doesn't help those with easterly declinations, of course (...