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USCG Exam PracticeCompass variation and deviation; T-V-M-D-C

When converting a true course to a compass course using the T-V-M-D-C mnemonic, which error is applied between the Magnetic and Compass values?

  1. A. Variation
  2. ✓ DeviationCorrect
  3. C. Declination
  4. D. Dip

Why B is correct

In the T-V-M-D-C sequence (True – Variation – Magnetic – Deviation – Compass), deviation is the error applied between the magnetic heading and the compass heading. Deviation is caused by the vessel's own magnetic field acting on the compass needle, and a deviation table is required by 33 CFR §164.35(c) and 46 CFR §28.230.

Cited:33 CFR §164.3546 CFR §28.230

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When converting a true course to a compass course using the T-V-M-D… — USCG Exam Practice · CaptainsGround