A Fog Horn.
The sound signal that you should hear when a power boat is in the fog is one prolonged blast at intervals of no more than 2 minutes.
Slow to minimum speed
If you hear a fog signal from another boat but cannot see it, you should reduce your speed and maintain a proper lookout. Use radar and other navigation aids to help determine the other vessel's position. Be prepared to take evasive action if necessary, and sound your own fog signal to alert others to your presence. Always stay vigilant and ready to respond to any potential hazards.
Slow to a minimum speed
Slow to a minimum speed
Slow to a minimum speed
Slow to a minimum speed
Slow to a minimum speed
Slow to a minimum speed
Reduce speed to bare steerageway.
Reduce speed - and maintain vigilance for the other vessel.
In fog, you should listen for fog signals such as fog horns or whistles from nearby boats or ships. These signals help vessels communicate their presence and location to prevent collisions in reduced visibility conditions.