Definition
CADET stands for Compass Add East to get True, meaning that going from compass towards true one adds easterly errors and subtracts westerly ones; reversing the process reverses the signs. The older rhyme Error East, Compass Least, Error West, Compass Best expresses the same relationship. Another common chain is True Virgins Make Dull Companions, ordering True, Variation, Magnetic, Deviation, Compass, with Add Whisky reminding that westerly errors are added going down the chain.
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