What are the dangers of sailing in foggy weather?

Stranding, hitting rocks, collision, getting lost and other accidents.

As for "Star Trek", tell a joke that is not a joke: a small cargo ship in our unit left at night, but when I went to work in the morning, I found out how it landed. I didn't know it turned 360 degrees, so I came back.

Typical is the great river channel (such as the Yangtze River). The middle and lower reaches of the Yangtze River look vast on the surface, but in fact there are many shoals below, which pose a great threat to the navigation of large ships (especially in dry season). Where can bigger ships pass, only by beacon lights. If you can't see the position of the beacon light, you can't avoid the danger only by the compass. Some big ships are equipped with radar to detect the position of navigation lights, but it is impossible to avoid some ships without radar hitting them. Therefore, even if the satellite positioning system and special software are installed, the position of the ship in the river can be well grasped, but it is still necessary to be very cautious when sailing in foggy days.