As she neared the end of her useful seagoing life in 1940, "Vina" was requisitioned as a naval vessel for wartime use as a blockship, carrying a crew of 12. With Great Yarmouth being a strategic port on the east coast, the ultimate fate for the ship would have been to have had her hold filled with concrete and explosives and she would have been sunk at the harbour mouth, blocking entry in the event of a Nazi invasion. Once this threat passed, she was taken out of blockship service and towed up the east coast towards Brancaster where she was used as a target for the RAF before the planned invasion of Normandy in 1944.