What's this?

OK so I failed to challenge the master last time we'll try another tack.
Being a boat yardy type and currently in the process of buying a new travel hoist I smiled when seeing what they were using at a prominent yard last year and wondered why we were spending 100k when a bit of stick, a double block with a becket and a length of wire obviously suffices elsewhere.

Anyone care to guess where it is?

Zierikzee?
 
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