INLAND ONLY A light used to signal passing intentions must be an __________.

Correct Answer: Option D — all-round white or yellow light

33 CFR 83.34(b) permits the use of a light to supplement whistle signals. This light must be an all-round white or yellow light, flashing at 50 to 70 flashes per minute, and must be visible at a minimum range of two miles, providing visual confirmation of the vessel's intended maneuver.