What signal is used when a vessel is being towed in restricted visibility?

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Multiple Choice

What signal is used when a vessel is being towed in restricted visibility?

Explanation:
In restricted visibility, vessels use specific sound signals to convey what they’re doing. The signal indicating a towing operation is one prolonged blast followed by three short blasts. This distinctive pattern alerts nearby traffic that a vessel is being towed (or is towing another) so others know to take extra care, keep clear, and pass with caution. If the towing continues, this signal should be repeated at about two-minute intervals. The other sequences do not communicate that a towing operation is underway.

In restricted visibility, vessels use specific sound signals to convey what they’re doing. The signal indicating a towing operation is one prolonged blast followed by three short blasts. This distinctive pattern alerts nearby traffic that a vessel is being towed (or is towing another) so others know to take extra care, keep clear, and pass with caution. If the towing continues, this signal should be repeated at about two-minute intervals. The other sequences do not communicate that a towing operation is underway.

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