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 in the compass card
- BDeviation only, because variation is printed on the nautical chart
- CBoth variation and deviation, where a magnetic compass is fitted and charts have enough detail to enable this correction✓ correct
- DNeither variation nor deviation if a GPS receiver is also installed
Why C is correct
33 CFR §164.78(a)(5) requires the person directing and controlling movement of a towing vessel to know and apply the variation and deviation where a magnetic compass is fitted and where charts or maps have enough detail to enable this type of correction. No exception is made for the presence of GPS.
Cited:33 CFR §164.78
Drill more Plotting with variation and deviation (T-V-M-D-C) questions
Every CaptainsGround answer cites the rule it tests — verified, not guessed. Try a free 5-question drill, no sign-up.
More practice questions
- When a magnetic compass is fitted aboard a towing vessel, the person directing and cont…
- Which of the following is a correct statement regarding the use of buoys to fix the pos…
- Before a towing vessel of less than 1,600 GT embarks on a voyage of more than 24 hours,…
- A self-propelled vessel of 12,000 gross tons carrying hazardous materials in bulk as ca…
- According to the IMO performance standards incorporated in 33 CFR §164.38, an ARPA equi…
- An ARPA display on which ARPA information is presented must have an effective diameter …