🔍 Key Concepts

• Sound signals in restricted visibility (fog) for vessels underway and vessels being towed – Navigation Rules, Rule 35 • Special requirements for manned vs. unmanned tows and which parts of a tow must make their own sound signals • Difference between signals for the towing vessel, the last vessel of the tow, and vessels in between

💭 Think About

• First, decide which part of the tow this question is about: Is the second barge in the middle, the first, or the last in line? How does that affect its responsibilities? • Ask yourself: Under Rule 35, which vessels in a tow are specifically required to make their own fog signals, and which are silent? • Compare the listed signals with the standard fog signals: Which patterns (prolonged vs. short blasts) are normally used for power-driven vessels underway, vessels being towed, and other special cases?

✅ Before You Answer

• Verify in Rule 35 whether every vessel in a tow must sound a signal, or only the tug and/or the last vessel of the tow • Check if there is a special signal pattern assigned to the last vessel of a tow and whether that applies to a middle barge • Confirm whether the fact that the barges are manned changes the requirement for the middle vessel’s sound signal in fog