Question 41 RVR01 - Master of Unlimited Tonnage

The Correct Answer is C **Why option C ("all-round white or yellow light") is correct:** In inland waters (such as rivers, lakes, and navigable canals within the United States), the specific regulations governing navigation and signaling are often derived from the U.S. Inland Navigational Rules (33 CFR Subchapter E). The rule concerning lights used to signal passing intentions (often referred to as a "flashing light" or "signal light") dictates that vessels engaged in passing or maneuvering must use a light that is visible all around the horizon (360 degrees) and is either **white or yellow** in color. This configuration ensures that the passing signal is unambiguous and universally recognized in the inland environment, distinguishing it from standard running lights or emergency lights. **Why the other options are incorrect:** * **A) all-round white light only:** While an all-round white light is acceptable, the rule also explicitly permits an all-round yellow light. Therefore, stating "white light only" is incomplete and excludes an allowable option. * **B) alternating white and yellow light:** Signaling lights are required to be a steady color (either white or yellow, often flashed intermittently for the signal), not a single light source that alternates between two colors. This configuration is not specified or permitted for signaling passing intentions. * **D) alternating red and yellow light:** Red lights are generally reserved for warning signals, port running lights, or specific vessel status indications (like restricted maneuverability). Using red in an alternating passing signal would be confusing and violate the regulations for maneuvering signals.