Question 45

The Correct Answer is B **Explanation for B (One prolonged blast):** The action described (a vessel nearing a bend or an area where other vessels may be obscured) is a maneuver related to a restricted visibility zone, often referred to as a "blind spot." According to Rule 34(e) of the International Regulations for Preventing Collisions at Sea (COLREGs), which applies to both international and inland waters in the U.S. (subject to local adaptations), a vessel nearing a bend or an area of a channel or fairway where other vessels may be obscured by an intervening obstruction is required to sound **one prolonged blast**. This serves as a warning signal to any vessel approaching from the opposite direction. **Why the other options are incorrect:** * **A) One short blast:** This signal indicates a change in course: "I am altering my course to starboard." It is a maneuvering signal, not a warning signal for an obscured bend. * **C) Two short blasts:** This signal indicates a different course change: "I am altering my course to port." It is also a maneuvering signal, not the required warning for an obscured bend. * **D) One long blast:** While "prolonged" and "long" are often used interchangeably in common language, the specific technical term defined in Rule 32 of COLREGs is a **prolonged blast**, defined as a blast of from four to six seconds duration. Although a prolonged blast *is* a long blast, using the specific term (B) aligns precisely with the regulatory requirement for this maneuver (Rule 34(e)). Furthermore, the general term "long blast" is not the standard regulatory terminology used to define the specific signal required under this rule, making the precise term "prolonged blast" the superior and correct answer in a regulatory context.