When required, a full answer, consisting of the call sign of the calling station and the prosign DE followed by the call sign of the station answering, may be used. In the flashing light procedure when giving an immediate receipt to a message in response to the prosign K, use the prosign R singly without the ending sign K or AR. RELAYING INSTRUCTIONS When  relaying  responsibilities  are  automatic, relaying  instructions  need  not  be  inserted  in  the transmission  instructions. The prosign T is to be used when signals/messages are   passed   through   a   relay   when   the   relaying responsibilities  are  not  automatic  and  the  originator requires no report of delivery. The address component is mandatory. When a message is received with the prosign T standing alone in the procedure component of the heading, it means “Station called transmit this message to all addressees.” Examples: Suppose that C60 transmits a message to R55, with instructions for R55 to transmit the message to F31; in that case, the heading would be as follows: R55 DE C6O T R 231210Z MAR 96 FM C87 TO R55 F31 BT Prosign T followed by a call sign in the procedure component  means  “Station  called  transmit  this message to station(s) whose call follows T.” Assume that C60 transmits a message to R55 with instructions for  R55  to  transmit  the  message  to  one  of  the addressees—in this instance, B62: R55 DE C60 T B62 R 231210Z MAR 96 FM C60 TO R55 F31 B62 GR4 BT UNCLAS RETURN HOME SOON. BT K Prosign T both preceded and followed by call signs means “The station indicated before T is to transmit  this  message  to  the  station(s)  indicated immediately following T.” Station C60, transmitting a message to R55 and F31, instructs R55 to transmit the message to B62: F31 R55 DE C6O R55 T B62 R 231210Z MAR 96 FM C60 TO B62 F31 R55 GR4 BT UNCLAS RETLURN HOME SOON. BT K When   transmission   is   accomplished,   all addressees (B62, F31, R55) will have received the message. The prosign L is to be used when the originator requires relaying ships to report through the chain of command when the message has been delivered. The prosign L is not to be used in the transmission instructions  of  executive  method  messages.  The prosign L must, however, be passed in to the originator by  relaying  ships  when  the  text  of  the  executive method message has reached the last ship in the chain of visual responsibility. It is not to be passed in for the executive signal nor for messages where no response procedure is used. The prosign L must be passed to the originator by a ship that relays an emergency alarm signal to the OTC. NOTE Visual call signs must NOT be used in the transmission instructions or address of mes- sages  to  be  transmitted  or  relayed  by  other than visual means. SPECIAL  PROCEDURES The  signals  listed  are  signals  used  in  special circumstances.  ACP  129  covers  procedures  for  using these special signals. Calling an unknown station No-response  procedure Double-flash   procedure Exchanging identities with the senior officer present afloat (SOPA) Alarm  procedure  for  enemy  reporting Special visual prosign OL Synchronizing  time CORRECTIONS AND REPETITIONS Errors or omissions noted by the transmitting operator are to be corrected as follows: During transmission, the operator should transmit the error prosign, repeat the last word, group, prosign, or  operating  signal  correctly  transmitted  before  the error, followed by the correct word, group, prosign, or operating signal, and continue on. When transmission is completed but before a receipt is obtained, the 4-6