BOTH INTERNATIONAL & INLAND You are underway in fog when you hear the following signal: one short blast, one prolonged blast and one short blast in succession. Which of the following would it be?
• Rule 35 – Sound signals in restricted visibility (what each type of vessel must sound) • The special additional signal for a vessel at anchor when another vessel is approaching • Differences between signals that start with a prolonged blast vs. those that start with a short blast
• First, recall which vessels in fog use a prolonged blast as their main signal, and which ones use bells or gongs instead. • Ask yourself: which type of vessel would ever use a sequence that begins and ends with a short blast, with a prolonged blast in the middle? • Compare the standard required fog signals with any optional/extra warning signals allowed when there is risk of collision.
• Verify in Rule 35 which vessels use one prolonged blast or one prolonged plus two short blasts as their main fog signal. • Check which vessel uses bell or gong as its primary fog signal instead of whistle blasts. • Confirm which vessel is allowed to sound one short, one prolonged, one short as an additional warning when another vessel is approaching.
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