BT 3891939-1946Registry of Shipping and Seamen: War of 1939-1945; Merchant Shipping Movement Cards
The cards give the name of a ship and details of its movements, namely, the ports at which it docked, and passage between ports. They also record the location (by latitude and longitude) and date a ship was sunk. It should be noted that the cards do not always reflect changes in the ship's name and that it may be necessary to search for a ship under its various names.