Question 45 ONC07 - OUPV-Near Coastal

The Correct Answer is B **Why option B ("One prolonged blast") is correct:** According to both the International Regulations for Preventing Collisions at Sea (COLREGs Rule 34) and the Inland Navigation Rules (33 CFR §83.34), 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 signal serves as a warning to approaching vessels that may not be visible. **Why the other options are incorrect:** * **A) One short blast:** This signal, defined as a blast of about one second's duration, is typically used to indicate maneuvering actions, such as "I intend to leave you on my port side" (in the International Rules) or "I intend to pass you on your port side" (in the Inland Rules). It is a maneuvering signal, not an obstruction/warning signal for a blind bend. * **C) Two short blasts:** This signal indicates a different maneuvering intention, such as "I intend to leave you on my starboard side" (International) or "I intend to pass you on your starboard side" (Inland). Again, this relates to passing intentions, not warning others around a blind bend. * **D) One long blast:** While "prolonged" and "long" might sound similar, the defined term in the rules is **prolonged blast** (a blast of from four to six seconds' duration). "Long blast" is not the specific, regulated term used for this warning signal in the context of navigation rules.