Visibility Measurement

[mobeydick]

I sure one of you clever people know...

How do they automatically measure visibility on, e.g. the Bramble Bank pole?

Count how many boats hit it per hour?

 

[bdsweeting]

Doing a Google on measuring visibilty brings up some interesting things...

Try this one to confuse the brain.

http://www.allweatherinc.com/reference/fsvs.html

 

[Cornishman]

OMG they have come some way since the flashing blue light!