USCG Exam Practice · Plotting with variation and deviation (T-V-M-D-C)
When a magnetic compass is fitted aboard a towing vessel, the person directing and controlling movement of the vessel is required to do which of the following?
- AKnow and apply the variation and deviation where charts have enough detail to enable this correction✓ correct
- BApply deviation only, as variation is already printed on the chart compass rose
- CApply variation only when operating seaward of the territorial sea baseline
- DVerify compass error against GPS heading at the start of each watch
Why A is correct
33 CFR §164.78(a)(5) requires the person directing and controlling the vessel to know and apply both variation and deviation where a magnetic compass is fitted and where charts or maps have enough detail to enable this type of correction. The regulation does not limit the requirement to offshore waters or to deviation alone.
Cited:33 CFR §164.78
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