Fog! What vessel signals are needed during fog.



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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