The Danish shipping company's vessel can house up to 12 passengers. It will also act as a crew transfer and storage vessel. It was built in 2013 with a top speed of 26 knots.
"Sea Comfort has been contracted to the Gwynt y Môr project initially for three months, and is supporting our cable termination teams. It began working on site about a week ago," a spokesman from developer RWE Innogy said.
All 160 Siemens 3.6MW turbines have been installed at the site, 13 kilometres off the North Wales coast.
The last of the inter-array cables are still being put into place, but a planned inspection of Reef Subsea's installer vessel, Polar Prince, has meant installation at the site has been placed on hold. The vessel is due return to the site this week to continue operations.
Gwynt y Môr is majority owned by German developer RWE Innogy (60%). Energy supplier Stadtwerke München (30%) and technology giant Siemens (10%) also have stakes.