Question 18 RVR02 - Master of LT 500-1600 GRT

The Correct Answer is A **Explanation for A (One prolonged blast):** The sound signal of "One prolonged blast" is the prescribed signal under both the International Regulations for Preventing Collisions at Sea (COLREGs) and the U.S. Inland Navigation Rules for a vessel nearing a bend or an area where other vessels may be obscured by an obstruction. This signal acts as a warning to any approaching vessel that may be hidden from view. Specifically, Rule 34(e) of COLREGs (and the corresponding Inland Rule) mandates this signal for such situations. **Explanation for B (Two short blasts):** Two short blasts are used to indicate an intention to alter course to port (left) in a meeting or overtaking situation, or as a general maneuvering signal. It is not the prescribed signal for warning vessels around a blind bend. **Explanation for C (One short blast):** One short blast is used to indicate an intention to alter course to starboard (right) in a meeting or overtaking situation, or as a general maneuvering signal. It is not the prescribed signal for warning vessels around a blind bend. **Explanation for D (One long blast):** While the terms "long blast" and "prolonged blast" are sometimes used interchangeably in casual conversation, the precise terminology used in the Navigation Rules (COLREGs/Inland) is "prolonged blast" (defined as a blast of 4 to 6 seconds duration). Furthermore, in a maneuvering context, the specific signal required at a bend is defined as "one prolonged blast." The term "long blast" is not the official term for this particular maneuver and does not clearly distinguish it from other signals (such as those used for restricted visibility).