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Re: How to tell how thick the fog is...
Another way to look at it, if you sail into fog at 6 knots and someone is coming at you at 6 knots from the opposite direction, you have about 30 seconds to see each other before you collide if visibility is 1/8 mile (15 miles in 60 minutes or 1/4 mile in one minute closing rate,) not to mention fog can be denser in one spot than another ie visibility could get worse before it gets better. Makes radar (and knowing how to use it) or staying out of the fog seem like a good idea IMHO. Barges and other large vessels often travel much faster than 6 knots and the bigger they are the larger the radar shadow they have in front of them.