Ports may require taking on a local Harbor Pilot but under IMO rules the ship's captain is still in charge and responsible for safe navigation. FWIW, when the QE-II was damaged by an uncharted wreck in Long Island Sound, the Captain chose to disregard the advice of the harbor pilot.
The way the wreck is laying, radar would not "see" it.
My radar comment addressed the initial collision that got it that way. By this time, the causuality should be surrounded by lighted markers with radar reflectors, and period warnings to navigators should be broadcast almost continously. There should probably be a French Naval or Coast Guard vessel nearby to warn-off that 5% that didn't get the word. This is sick.
BTW, I watched the hydroplane ferry from Calais to Dover from the Dover jetty once, before the chunnel opened. Damnest thing I've ever seen. It had to be going 70+ kt in about 2 miles of visibility. The ferry blew in and hit the landing ramp at just the right speed to come to a stop on top. It was the most impressive piece of seamanship I've ever witnessed. I guarantee you they had an active and alert radar watch.
I'm convinced that the British are still the finest seamen in the world.
Absolutely!