Hi! boating colleagues, today we will speak about the fog, since at this moment, as you can see in the photo, it is arriving Port Ginesta. A natural phenomenon that can put us in a difficult situation; we can go sailing with a fantastic day and, sudenly, because of the difference in temperatures, warmer temperature and cool air, creates the evaporation leading the fog and causing a situation of stress / panic if not carrying the appropriate equipment.
In many occasions (I include myself in this), we think: “I do not need radar for anything, since I do not sail at night”. Serious error, since the radar and GPS in a case of thick fog, can protect us from a serious accident either against another boat or port entrance.
So friends, my advice is, to equip your boats well or check very carefully the meteo (although the fog is difficult to predict)
Here is an interesting article, Salut and Invictus Yacht
The fog is one of the biggest dangers that we can find in the sea and is cause of many collisions.
The fog are clouds very low that come to be in contact with the surface of the earth or a very short distance. When the visibility is less than a kilometer we say there is fog. A very thick fog will have a visibility less than 50 meters.
– Mist: Visibility less than 1 kilometer.
– Haze: Visibility between 1 and 2 kilometers.
– Mist: Visibility greater than 2 kilometers.
– Calima: Decreased visibility by solid particles in the atmosphere.
Meteorologically the calima is not considered fog.
The true fog of the sea is the fog of condensation:
It occurs when moist and warm air moves above the surface of cold water. The water vapor that is suspended in warm air condenses on cooling to the cold temperature of the water and forms small droplets. The temperature at which saturation occurs is known as the dew point.
In case of fog:
In case of fog, the most important thing is to maintain a constant visual surveillance reducing the speed of the boat to be able to have enough time of reaction in case of a possible collision. The distances are difficult to calculate and the sound being muffled by the fog makes it difficult to know its origin, especially with thick fog. We must also turn on the navigation lights, issue the mandatory sound signals, place radar reflectors, stop immediately or reduce the speed to the minimum of government in case we hear signals from another boat.
Source: Sail & Trip