BOTH INTERNATIONAL & INLAND You are approaching a bend in a river where, due to the bank, you cannot see around the other side. A vessel on the other side of the bend sounds one prolonged blast. In response, which signal are you required to sound?
• Rule 9 – Narrow Channels and how sound signals are used in rivers and channels • The meaning and purpose of one prolonged blast in or near a bend • When vessels are required to answer another vessel’s sound signal
• Ask yourself: In a narrow channel with a blind bend, what is the primary purpose of the first prolonged blast? Is it a passing agreement or a warning of presence? • Consider whether you are supposed to make an agreement about port/starboard passing or simply let the other vessel know you are also there. • Think about which of the listed options would best reduce collision risk when you cannot yet see the other vessel.
• Verify what the Navigation Rules say a prolonged blast means when approaching a bend in a channel. • Check whether the rule calls for an immediate response in kind (same signal) or for maneuvering/passing signals. • Confirm that danger signals (5 short blasts) are only required when there is doubt or confusion about another vessel’s intentions, not just because you are near a bend.
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