So they take an old GoM crew boat and intent to use it as a Crew Transfer Vessel for a wind farm. (??)
This is the type of CTW that is commonly used in the southern part of the North Sea:
For the northern parts and floating wind mills far from shore, a more sophisticated and faster type has been developed:
I presume you could add this device on an old crew boat:
Meanwhile, new designs to suite specific areas and conditions are being developed all the time as wind farms gets established in new parts of the world and new needs evolve.