Which rule governs the sound signals used in restricted visibility?

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Sound signals in restricted visibility are governed by Rule 35. This rule specifically covers how and when vessels must use fog signals to communicate their presence, actions, and intentions to others when visibility is poor, providing the standard signaling framework for restricted visibility. It’s the reference that directly defines the fog signal requirements, separate from the general navigation and collision-avoidance rules that govern lookout, speed, and maneuvering. The other rules guide overall safety and decision-making but do not establish the specific fog-signal regime, so Rule 35 precisely addresses the signaling in restricted visibility.