In 1964 Calshot was sold to Port & Liner Services (Ireland) Ltd., a subsidiary of Holland America Line and renamed Galway Bay. Her triple expansion steam engines were replaced by twin diesels in Holland, built by Bolnes of Krimpen. This conversion resulted in the funnel being considerably shortened. Repainted in Holland America Line colours, she was based at Galway in Eire, and used to ferry passengers from the liners Maasdam and Ryndam in the bay, to the pier in the harbour.
This activity was short lived and she was then used for regular sailing’s with at least 400 passengers from Galway to the Aran Islands of Inishmore, Inishmann and Inisheer which stretch across the entrance of Galway Bay.
In 1971 Calshot was bought by Galway Ferries Ltd. For the next 16 summers she undertook the passenger service from Galway to Kilrona carrying thousands of tourists. During her time as Galway Bay, she was not maintained to the highest standards in Ireland. This resulted in a slow deterioration of her overall condition.