USCG Exam PracticeRule 23 — Power-driven Vessel Underway (lights)
A power-driven vessel is operating on the Great Lakes at night. Which substitution for the standard underway lights prescribed in Rule 23(a) is authorized?
- A. An all-round white light may be carried in lieu of the forward masthead light and sidelights
- ✓ An all-round white light may be carried in lieu of the second masthead light and sternlight, placed in the position of the second masthead lightCorrect
- C. An all-round white light and sidelights may be carried in lieu of all lights prescribed in paragraph (a)
- D. A flashing yellow all-round light may be substituted for the sternlight
Why B is correct
33 CFR §83.23(e) specifically authorizes a power-driven vessel operating on the Great Lakes to carry an all-round white light in lieu of the second masthead light and sternlight, placed in the position of the second masthead light and visible at the same minimum range. Option C describes the alternative for vessels under 12 meters per §83.23(d), which is a separate provision.
Cited:33 CFR §83.23(e)