Post History
There's a mnemonic: Can Dead Men Vote Twice At Elections? The first letters in this sentence indicate the meaning: Compass +/- Deviation = Magnetic +/- Variation = True (Adding Easterly). This me...
Answer
There's a mnemonic: Can Dead Men Vote Twice At Elections? The first letters in this sentence indicate the meaning: Compass +/- Deviation = Magnetic +/- Variation = True (Adding Easterly). This me...