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Given a deviation of –6°, 12ºW variation and a True heading 186°. The correct headings are:
  • A
    198°(M), 192°(C).
  • B
    180°(C), 174°(M).
  • C
    168°(C), 174°(M).
  • D
    198°(M), 204°(C).
Compass Deviation. The angle between Compass North and Magnetic North.
  • I.e. Deviation -6º means that the Compass North lies to the west of Magnetic North
Deviation (-) West – Compass Best
Deviation (+) East – Compass Least
Magnetic Variation. The difference between True North and Magnetic North.
  • Use this mnemonic: Variation west, the magnetic "best" (or greater than true).
    Variation east, magnetic "least" (or less than true).                         
​​Variation (-) West – Magnetic Best
Variation (+) East – Magnetic Least
Compass Heading
(C)		 Deviation (D) Magnetic heading (M) Variation (V)
True heading
(T)
204º
(198º + 6º)
Deviation West, Compass Best		 -6º 198º
(186º + 12ºW)
Variation West, Magnetic Best		 12ºW 186º

 

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