These examples illustrate the convenience of international procedure signals and signs: 1. 2. The general call signal (or call for unknown station) AA AA AA is made to attract attention when wishing to signal to all stations within visual signaling distance or to a station whose name or identity signal is not known. The call is continued until the station addressed answers. The answering signal TTTT is made to answer the call and it is continued until the transmitting station ceases to make the call. The transmission starts with the signal DE followed by the name or identity signal of the transmitting station. Example: When one of the stations is other than an Allied naval ship, STATION "A" TRANSMITS STATION "B" TRANSMITS AA AA (until answered) TTTTT (until call ceases) DE NABC DE NABC KFLN KFLN A R R 3. The letter T is used to indicate the receipt of each word or group. 4. The erase signal EEEEEE indicates that the last group or word was signaled incorrectly. It is answered with the erase signal. When answered, the transmitting station will repeat the last word or group that was correctly signaled and then proceed with the remainder of the transmission. 5. The repeat signal RPT is used as follows: By the transmitting station to indicate that it is going to repeat ("I repeat"). If such a repetition does not follow immediately after RPT, the signal should be interpreted as a request to the receiving station to repeat the signal received ("Repeat what you have received”). By the receiving station to request a repetition of the signal transmitted (“Repeat what you have sent”). The special repetition signals AA, AB, WA, WB, and BN are made by the receiving station as appropriate. In each case, they are made immediately after the repeat signal RPT. Examples: RPT AB KL—"Repeat all before group KL." RPT BN BOATS SURVIVORS—"Repeat all between words boats and survivors." If a signal is not understood or, when decoded, is not intelligible, the repeat signal is not used. ‘The receiving station must then make the appropriate signal from the Code, indicating “Your signal has been received but not understood.” 6. A correctly received repetition is acknow- ledged by the signal OK. The same signal may be used as an affirmative answer to a question ("It is correct"). 7. The ending signal AR is used in all cases to indicate the end of a signal or the end of a transmission. The receiving station answers the signal R—“Received” or “I have received your last signal.” 8. The transmitting station makes the signal CS when requesting the name or identity signal of the receiving station. 9. The waiting signal or period signal AS is used as follows: When made independently or after the end of a signal, it indicates that the other station must wait for further communications (waiting signal). When it is inserted between groups, it serves to separate them (period signal) to avoid confusion. 10. The signal C should be used to indicate an affirmative statement or an affirmative reply to an interrogative signal; the signal RQ should be used to indicate a question. For a negative reply to an interrogative signal or for a negative statement, the signal N should be used in visual or sound signaling, and the signal NO should be used for voice or radio transmission. When the signals N or NO and RQ are used to change an affirmative signal into a negative statement or into a question, respectively, they should be transmitted after the main signal. Examples: CY N (or NO, as appropriate)..."Boat(s) is (are) not coming to you." CW RQ—“Is boat/raft on board? The signals C, N or NO, and RQ cannot be used in conjunction with single-letter signals. SOUND SIGNALING Because of the apparatus used (whistle, siren, foghorn), sound signaling is necessarily slow. Moreover, the misuse of sound signaling could create 6-7