2. Crew transfer vessels (CTV) are mainly used to transport offshore personnel
and smaller cargo units.
The fender system at the bow helps the vessel to approach the access ladder
of a wind turbine or an accommodation vessel and facilitates safe boarding of
personnel.
Crew transfer vessels are designed to transport 12 people; larger units can
transfer 24 people and more.
https://workboathire.com/listing-category/wind-farm-supportcrew-
transfer-vessel