TUB INTERNATIONAL CODE OK SIGNALS 645

Use of Procedure Signals and' Signs-
C ( ---- ).

The letter 0 signifies "You are correct."

When a word, or group, in the text of a message, is repeated back,
the letter "0" is used by the transmitting ship to indicate to the receiving
ship that the repetition has been made correctly.

De (mm mm .).

The word "De" used in the identity signifies: "From - ." Thus:
De G X D E, "From ship whose signal letters are G X D E."

G( --- ).

The letter 0 signifies "Repeat back." It may be inserted at the
beginning of the text of a plain language message, and is signalled
separately. When so used it signifies: "Everything which follows
in this message is to be repeated back, word byword, as soon as received."

The letter R signifies: "Message received."
T (— )
The letter T is used to indicate the receipt of each word in the text
of a plain language message.
W (. -- )
The letter W used as a message in itself signifies: "I am unable to
read your message owing to light not being properly trained or light
burning badly." This is to be made by the receiving ship at any stage
of the message, if required, and is to be answered by the transmitting*
ship showing a steady light until the receiving ship is satisfied with
the light and ceases to make W.
Call for Unknown Ship and General Call.
The call for unknown ship and general call AA AA, etc. (•— • » —
mmm mmmm9 etc.), is used to attract attention when wishing to signal
to a ship whose name is not known. It is the normal method of calling.
up at sea, and is to be continued until the ship addressed answers. -