USCG Exam Practice · Plotting with variation and deviation (T-V-M-D-C)
When operating a vessel with a magnetic compass, a person directing and controlling the movement of a towing vessel is required to know and apply which of the following?
- AVariation and deviation, where charts have enough detail to enable this correction✓ correct
- BVariation only, as deviation is accounted for by the compass manufacturer
- CDeviation only, as variation is pre-printed on all nautical charts
- DNeither variation nor deviation, as GPS supersedes magnetic compass corrections
Why A is correct
33 CFR §164.78(a)(5) requires that the person directing and controlling a towing vessel knows and applies both variation and deviation where a magnetic compass is fitted and where charts or maps have enough detail to enable this type of correction. Neither variation nor deviation alone satisfies the regulatory requirement.
Cited:33 CFR §164.78
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