Question 45 MODU01 - Offshore Installation Manager

The Correct Answer is B **Explanation for Option B (One prolonged blast):** The rule governing sound signals in restricted visibility and in situations like approaching a bend where visibility is obscured is primarily covered by Rule 34 (Maneuvering and Warning Signals) and Rule 35 (Sound Signals in Restricted Visibility) of the COLREGS (International Regulations for Preventing Collisions at Sea), and mirrored in the Inland Rules (34). When a power-driven vessel is nearing an area of a channel or fairway where vessels may be obscured (such as a bend or obstruction), **both International (COLREGS Rule 34(e)) and Inland Rules require the vessel to sound one prolonged blast.** This signal acts as a warning or cautionary signal to alert any unseen vessel that traffic is approaching that section of the waterway. **Explanation for Incorrect Options:** * **A) One short blast:** This signal indicates the vessel is taking action to change course to starboard (International/Inland Rule 34(a)(i)). It is a maneuvering signal, not a precautionary warning signal for an obscured bend. * **C) Two short blasts:** This signal indicates the vessel is taking action to change course to port (International/Inland Rule 34(a)(ii)). Like one short blast, it is a maneuvering signal, not the specific warning required for an obscured bend. * **D) One long blast:** While "prolonged" and "long" are often used interchangeably in casual speech, in COLREGS and Inland Rules terminology, the required signal for an obscured bend is specifically defined as **one prolonged blast** (lasting 4 to 6 seconds). The term "one long blast" is generally not the official terminology used for this specific warning signal, making "One prolonged blast" the precise and correct answer based on the regulations.