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