Object Detail


Issued to British Merchant Ships in the First World War, these secret instructions were issued as a precaution against the German navy’s attempts to sink allied shipping. Inside are charts to aid the identification of enemy and allied shipping and detailed navigational instructions at sea. A range of zigzag courses are set out as a means of avoiding being torpedoed by U-boat submarines. Weighted with lead, this book was designed to be thrown overboard in the event of being intercepted. This copy, now declassified, was presented by the Lords Commissioners of the Admiralty to Captain R. Dawson Master of S.S. Reval for his retention as a memento of War Service, 1st July, 1919. It is now on display at Trinity House, Leith.
Date Made
1917
Period
Dimensions
248 x 168 x 23mm
Property Information
Accession No
TRH453

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