🔍 Key Concepts

• Inland Rule 34(a) – when are whistle signals required for meeting or crossing situations? • Difference between one-blast and two-blast signals under the Inland Rules (what passing arrangement does each mean?). • Special Inland provision allowing use of radiotelephone instead of whistle signals when certain conditions are met.

💭 Think About

• Look at the picture: Are the vessels in a true head‑on meeting situation, or are they simply passing at a safe lateral distance? How does that affect whether signals are required? • Under Inland Rules, when vessels are within one‑half mile and in sight of one another, what MUST they do before maneuvering to pass? • In what exact case does the Inland Rule say that if they reach agreement by radiotelephone, they may omit whistle signals?

✅ Before You Answer

• Confirm the distance threshold in Inland Rule 34(a) for when maneuvering signals are required (compare it to the 1/4‑mile in the question). • Verify which passing side corresponds to one blast and which to two blasts in Inland waters. • Check the wording of the Inland Rule about radiotelephone agreement – does it say they "may" omit whistle signals, or that they "must" still use them?