Convoy miscellany including : tables of times taken by vessels proceeding down - Channel from London to join convoys at Plymouth; correspondence with C-in-C's office, Devonport, regarding convoy arrivals; forms of secret route instructions to be given to ships' Masters; hints to Masters on adoption of zigzag courses; secret code-books for ships; key to secret route-chart; route-rules for ships bound to and from S. American ports; the position of neutral ships operating a British transports; the loss of a code-book, and the danger of enemy aliens signing on as hands of British ships in New York (1916) etc. 1915 - 1918