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 only, because deviation is accounted for by the compass manufacturer
- BDeviation only, because variation is printed on the chart rose
- CBoth variation and deviation, where a magnetic compass is fitted and charts have enough detail to enable this correction✓ correct
- DNeither variation nor deviation when operating on inland waters
Why C 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. No inland-waters exemption from this requirement exists in the cited section.
Cited:33 CFR §164.78
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