When she entered service on 3 July 1983, she was the biggest ferry ever in the Sealink Isle of Wight fleet, and the first able to carry more than 100 cars.

St Catherine was present at the International Fleet Review in 2005, representing Wightlink with a number of her sisters.

In 2010 St Catherine was sold to Delcomar and sailed from Hythe to Sardinia as GB Conte on 31 July 2010, with a crew of 11 on board.

St Catherine was the first of the Isle of Wight ferries to use a Voith Schneider asymmetric three-propeller layout with a bridge mounted forward.

GB Conte and Anna Mur currently sail between the Isola di San Pietro and Portovesme; an approximately 40-minute service with a frequency of 17 ferries a day in each direction during the summer season.