procedure for the executive method is governed by the following rules: Only  abbreviated  plaindress  messages  may  be used with the executive method. Executive method messages do not carry a time group. A message that requires a signal of execution carries the prosign IX immediately before the first BT. When using the executive signal, IX (5-second flash), the IX is effectively a stand by and should be repeated as often as necessary to ensure that all ships have received the stand by and are awaiting the order to execute.  The  moment  of  execution  will  be  the completion of the 5-second flash. In both directional and non-directional procedures, all ships repeat the IX being made to ensure the signal is ready for execution and repeat the executive signal (5-second flash) to ensure simultaneous execution. ·   The executive signal IX (5-second flash) alone after a call means “Execute all unexecuted messages transmitted  by  this  station  (by  the  executive  method)  to the same call.” · Requests  for  repetitions,  corrections,  or verifications of the texts of signals taken from a naval signal book must be for the entire text or for those portions separated by TACK. If there are more than two TACKS in any signal, further amplification by use of the nearest whole signal is required. Delayed Executive Method When  the  delayed  executive  method  is  used, receiving stations receipt for the message, and the signal of execution is made in a later transmission. Example: C8 transmits directly to C6: Immediate Executive Method In  the  immediate  executive  method,  the  text  is  sent twice separated by IMI. The executive signal, IX (5-second   flash),   is   made   at   the   end   of   this transmission. As a receipt cannot be obtained before execution of the message, the use of the immediate executive method must be authorized by the officer originating  the  message.  Directional  procedure  may be used with a single ship. Non-directional procedure must be employed if signaling with two or more ships at night. Immediate executive method is not normally used during daylight when signaling two or more ships unless the originating ship is fitted with DSL. It is not to  be  used  with  directional  flashing  light  when employing  no-response  procedures.  Examples  of immediate executive signals are located in ACP 129; study these examples to better familiarize yourself with  executive  method  procedures. Canceling Messages Once  the  executive  signal  has  been  made,  a message  cannot  be  canceled.  An  executive  method message  awaiting  execution  can  only  be  canceled  by a separate non-executive method message. To cancel all messages awaiting execution, the prosign NEGAT is transmitted. NEGAT preceded by a call cancels all executive method messages addressed to that call. To cancel  only  one  message  or  portion  of  several messages awaiting execution, the prosign NEGAT must be followed by identification data, consisting of a repetition of the text that is desired to be canceled. COMMUNICATING WITH AIRCRAFT When  communicating  with  aircraft,  keep  the following points in mind: 1. Flashing is only possible when the aircraft is occupying certain positions relative to the line of sight from the station from which the flashing is taking place. Because of the aircraft's rapid movement, the time during which it is in a favorable position for signaling is very short. 2. The signaler in the aircraft may have no one to write down the message for him/her. He/she may have to read the whole message, and write it down from memory or write down each word before sending a flash. It may, therefore, be advisable with a long message to use the double-flash procedure. 4-9