Question 41 RVR03 - Mate of LT 500-1600 GRT

The Correct Answer is C **Explanation for Option C (Correct):** Inland rules and regulations (specifically the U.S. Inland Navigational Rules, often mirroring international principles adapted for inland waterways) govern the signaling lights used by vessels to indicate intentions (like overtaking or meeting). The rules state that a vessel engaged in maneuvering or signaling passing intentions must use a light that is visible from all directions, allowing other vessels to understand the signal regardless of their position relative to the signaling vessel. This signaling light must be an **all-round white or yellow light**. The inclusion of both colors (white or yellow) provides flexibility based on national or regional inland standards, but the critical requirement is that the light must be "all-round." **Explanation for Incorrect Options:** **A) all-round white light only:** This is too restrictive. While white is commonly used, yellow is also explicitly permitted by the Inland Rules for this signaling purpose. **B) alternating white and yellow light:** Signaling lights indicating intentions (passing, maneuvering) are typically steady lights (all-round) to avoid confusion with flashing or alternating lights which usually signify warning, distress, or specific types of vessels (like air-cushion vessels). An alternating light is not the standard requirement for passing signals. **D) alternating red and yellow light:** Red lights are generally reserved for status indications (like port side, stopped, or dangerous cargo) or distress signals. An alternating red and yellow light would violate the signaling requirements for simple passing intentions and could cause severe confusion.