THE ANNUL is used to cancel all the message

9. METHOD OF ANSWERING. Each word or signal group, when understood is to be answered by one long flash mmm (T).

If a word or signal group is not answered, the sender is to repeat it until answered hy a long flash.

At the end of the message, if understood, the receiver will make . m^ - ^^ . . ( RD) . BOiSThe Erase and Annul signs are to be answered by their own signs.

10. THE NATIONALITY SIGNAL is made immediately after the answer to the Preparatory Signal has been received, to indicate the nationality of the vessel making the signal. It is answered by the nationality signal of the vessel receiving the message.

Article IV.

A printed copy of the code of urgent and important signals shall be placed in a prominent position in the chart room of every ship.