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COLUMN CALL SIGNS - 14244_134
FLAG SIGNALING - 14244_136

Signalman 3 & 2 - Aviation theories and other practices
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TAKING UP FORMATION When forming a convoy, ships should get to their correct station as quickly as possible, relative to the guide of the convoy. If the convoy is in columns in line ahead or in a formation involving small groups of ships, each column/group guide will take station on the guide of the convoy and station themselves on the guide of their own column/group. Ships should maintain their station in the formation on their guide, and should not be influenced by the movement of other ships unless the danger of collision occurs. While forming up, ships are to hoist their convoy station (convoy internal call sign) and keep it flying until all ships are in station. In narrow waters, each ship should make full allowances for wind and tide so as to pass over the same ground as the leading ship. This will not necessarily be achieved by following the wake of the next ship ahead. COMMUNICATION INSTRUCTIONS LEARNING OBJECTIVES: List and explain the primary and secondary means of convoy communications. Explain the use of external ship/shore communication. List the responsibilities of the master and communi- cation plan. List pubs used for convoy signals. List day and night signals for open and closed ports. The following types of communications are available: 1. Primary: Radiotelephone 2. Secondary: Flashing Light RADIOTELEPHONE The voice radiotelephone (R/T) procedure prescribed in ATP 2, volume II, is to be used for all voice radio communication. The convoy commodore is net control for voice radio communications. As was stated for allied voice communications, adherence to the prescribed procedure and good circuit discipline are essential to being efficient. Phonetic Alphabet When necessary to identify any letter of the alphabet, the standard phonetic alphabet is used. The correct pronunciation may be found in the International Code of Signals. Numeral Pronunciation Numerals, in transmission, are to be spoken in the English language. Only in cases of difficulty is the INTERCO system used. Numerals are to be transmitted DIGIT BY DIGIT. Prowords The prowords found in ATP 2, volume II, in general, correspond to those in ACP 125, with the following exceptions: ALARM—This ship has sighted or been attacked by hostile or suspicious forces. KICK—Carry out antijamming procedures. REPEAT—Repeat transmission or portion indicated, or I repeat. CALL SIGNS Individual ship call signs vary according to the circumstances in which they are used. Where no other instructions have been received, the following rules apply: 1.   In harbor, for communications with local harbor authorities, use ship name or international call signs. 2. Independently routed ships, see the communications supplement of ATP 2, volume II. 3. In convoy, ships use their convoy station designations as their R/T and visual call sign. When transmitted by R/T, the station designation is preceded by the word ship. Special call signs for use within a convoy are shown in figure 7-3. EXECUTIVE MESSAGES Executive-type messages that are sent over the convoy radiotelephone net will include the proword EXECUTE TO FOLLOW immediately after the call, and the text is repeated twice. If there is a delay of several minutes between the transmission and the 7-7







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