Not sure of the exact location...but mabe some of this would apply..
The Channel, with traffic in both the UK-Europe and North Sea-Atlantic routes, is the world's busiest seaways carrying over 500 ships per day.
Following an accident
in January 1971 and a series of disastrous collisions with wreckage in February,
the Dover Traffic Separation System (TSS)
the world's first radar
controlled TSS was set up by the International Maritime Organization
In December 2002 the MV Tricolor
, carrying £30m of luxury cars sank 32 km (20 mi) northwest of Dunkirk after collision
in fog with the container ship Kariba
. The cargo ship Nicola
ran into the wreckage the next day. However, there was no loss of life.[citation needed
The shore-based long range traffic control system was updated in 2003 and presently, there is a series of Traffic Separation Systems in operation.
Though the system is inherently incapable of reaching the levels of safety
obtained from aviation systems such as the Traffic Collision Avoidance System
, it has reduced accidents to one or two per year.[citation
If you look at the navrules...."conduct in ANY visibility" while in a traffic separation scheme requires fishing vessels to avoid vessels using that scheme. There even may be a requirement to contact the controlling agency to even be in the scheme....did the fishing vessel comply? To be as effective/safe as aviation...the rules have to be followed closely because speed is so high and necessary to be safe in aviation...that concept may be debatable in the maritime community.