🔍 Key Concepts

• Rule 35 – Sound Signals in Restricted Visibility (know the different signals for vessels underway, at anchor, and aground) • Difference between a vessel at anchor and a vessel aground in fog signals • Required time interval between fog signals for anchored and aground vessels on vessels 100 meters or more and under 100 meters

💭 Think About

• First, recall what sound signal a power-driven vessel underway makes in fog, then compare that to anchored vessels and then to aground vessels—how do they differ? • Ask yourself: for a vessel aground, do you use just the bell, just the whistle, or a combination—and is there anything added to the normal anchor signal? • Pay close attention to which answers use one-minute vs two-minute intervals and which describe a pattern used for an anchored vessel vs one specifically aground.

✅ Before You Answer

• Verify under Rule 35 what the standard anchor signal is for a vessel of 100 meters or more and how often it is sounded. • Check what extra signal (if any) is required when that anchored vessel is also aground. • Confirm the time interval in the Rule (one minute vs two minutes) for bell signals at anchor or aground so you can eliminate any option with the wrong interval.