🔍 Key Concepts

• Rule 34 (International) – Maneuvering and warning signals: When are whistle signals required under the International Rules? • Difference between Inland passing signals (passing agreement) and International signals (maneuvering intention) on rivers and in channels. • Whether the situation in the illustration is a normal port‑to‑port meeting where each vessel can maintain course and speed at a safe distance (1/4 mile).

💭 Think About

• Ask yourself: Under the International Rules, must power‑driven vessels sound whistle signals any time they meet within 1/2 mile, or only when they are actually altering course as required or authorized by the Rules? • Look at the diagram: Will vessels A and B need to change course to pass safely 1/4 mile apart, or can they simply maintain their current side of the channel and pass safely? • Consider which of the answer choices clearly reflects Inland‑only practices on rivers (e.g., who traditionally initiates passing signals on a river under Inland Rules) and eliminate those for this INTERNATIONAL ONLY question.

✅ Before You Answer

• Verify in Rule 34(a) – International whether the phrase "when maneuvering" is key to requiring whistle signals. • Confirm from the illustration whether this is a standard port‑to‑port meeting with no significant course alteration needed to avoid collision. • Eliminate any choices that depend on Inland river conventions (such as which vessel initiates passing signals or using one/two blasts as a passing agreement) since the question specifies INTERNATIONAL ONLY.