🔍 Key Concepts

• Inland Navigation Rules requirement for vessels leaving a dock or berth • Difference between maneuvering and warning signals on the whistle (short vs prolonged blast) • When a sound signal is mandatory vs optional in Inland waters

💭 Think About

• Ask yourself: In Inland waters, does a power-driven vessel have to make a sound when she is getting under way from a dock, even if no other vessels are clearly affected? • Think about which type of blast (short or prolonged) is normally used to indicate general movement/getting underway versus altering course to port/starboard or astern propulsion. • Consider: Is there a specific Inland-only rule that mentions “leaving a dock or berth”? What signal does that rule connect to that action?

✅ Before You Answer

• Verify what Rule 34 – Maneuvering and Warning Signals (INLAND) says specifically about a vessel leaving a dock or berth. • Check which sound (short vs prolonged) is associated with course/engine maneuvers (like turning or using astern propulsion) versus getting underway from a dock. • Before choosing, be sure whether Inland rules allow you to say no signal is necessary in this specific situation, or if a signal is actually required.