🔍 Key Concepts

• Rule 35 – Sound Signals in Restricted Visibility: Know what is required for a vessel at anchor and what is optional. • Difference between required anchor signals (bell/gong) and optional whistle signals. • How an optional signal can help other vessels know your position and that you are not underway.

💭 Think About

• First, recall what sound signals are required for a vessel at anchor. Which of the answer choices looks more like a maneuvering signal rather than an anchor signal? • Think about the pattern: an anchor whistle signal is designed to say, in effect, “I am here and not moving ahead” – which sequence best matches that idea? • Compare each choice to any whistle signal you remember for overtaking, crossing, or leaving a dock; eliminate those that are clearly maneuvering signals.

✅ Before You Answer

• Verify in Rule 35 (g) what it says a vessel at anchor may sound in addition to the bell/gong signal. • Check that the pattern you choose is specifically described as an optional signal for a vessel at anchor, not a required signal for some other situation. • Make sure the signal you select is not one of the standard maneuvering signals used when vessels are underway (such as altering course to port or starboard, or operating astern propulsion).