Well as the rest of the replies, I carry Nav lights plus Gas operated fog horn. However, not been on the water to experience visibility poor enough to use them.
However, I would not like to be runing around in a fast Rib when conditions are that bad.
Surely we are not that stupid or am I being too naive?
From what I heard over radio at the w/end the same cannot be said for some yachties who were so determined to get on the water they forgot all the safety rules of good seamanship.
I feel for the poor sod who has to go out and rescue them when it all goses wrong.