Fog! What vessel signals are needed during fog.

Updated: Mar 8



It is always time to review fog signals while underway. All vessels underway in or near an area of restricted visibility, whether day or night, must make the following fog signals:


Power driven vessel making way - A powerboat making way through the water must sound one

prolonged blast at intervals of not more than 2 minutes.


Power driven vessel stopped, not making way - A powerboat that has come to a complete stop and is not making way must sound two prolonged blasts in succession with an interval of about 2 seconds between them at intervals of not more than 2 minutes.


Sailing vessel - A sailboat must sound three blasts in succession: one prolonged followed by two short blasts at intervals of not more than 2 minutes.


Vessel not under command or restricted in its ability to maneuver - both of these classes of vessel must sound three blasts in succession: one prolonged followed by two short at intervals of not more than 2 minutes.


Fishing vessel - Whether fishing with lines or nets, or trawling, a fishing vessel must sound three blasts in succession: one prolonged followed by two short at intervals of not more than 2 minutes.


Vessel constrained by its draft - This type of vessel must sound three blasts in succession: one prolonged followed by two short at intervals of not more than 2 minutes.


Vessel engaged in towing or pushing - All types of towboats and tug boats must sound three blasts in succession: one prolonged followed by two short at intervals of not more than 2 minutes.


Vessel being towed - The last vessel in a multi-vessel tow, if it is manned, must sound four blasts in succession: one prolonged followed by three short at intervals of no more than 2 minutes. If practicable, these blast should be made immediately after the fog signal of the towing vessel has been sounded. Unmanned tows are not required to sound fog signals.

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