🔍 Key Concepts

• Navigation Rules Rule 34(e) – Maneuvering and Warning Signals (bends in a channel) • Difference between a short blast and a prolonged blast in the sound signal definitions • When vessels may be obscured by an intervening obstruction (like a sharp bend in a channel)

💭 Think About

• Ask yourself: Which rule specifically covers a vessel nearing a bend in a channel or fairway where other vessels may be hidden? Look up that paragraph and see exactly what sound is prescribed. • Think about the purpose of the signal at a bend: is it to indicate an intended maneuver (port/starboard/astern), or is it a warning of presence? That will narrow down which type of blast is used. • Recall the formal definitions: how many seconds is a short blast versus a prolonged blast? Which one is used in rules about restricted visibility and bends to make sure others know you are there?

✅ Before You Answer

• Verify in the sound signal definitions section which term is used for a blast of 4–6 seconds – that’s the one used in warning/position signals, not just maneuvering intentions. • Check Rule 34(e) specifically: it tells you exactly what a vessel must sound when nearing a bend where other vessels may be obscured, and what any approaching vessel should do in response. • Make sure you distinguish between signals that mean “I am altering course to port/starboard” (1 or 2 short blasts) and the signal that simply announces your presence at a blind bend.