Selsey Bill Sub Aqua Club present The Mulberry Visiometer!
You may have already noticed the installation of this marvellous machine, a chain leading from a large block to the Outer Mulberry with floats placed every metre. No longer shall there be any doubt or discussion about what the vis was!
Simply descend down the chain from the mooring buoy, follow it to the end and you will find the visiometer.