Basic Operational Communication Doctrine, NWP 4, forms the basic communication plan for the operating forces. Naval Telecommunication Procedures Fleet Communication, NTP 4, supports and amplifies NWP 4. It contains substantially the same procedures and instructions issued in the JANAP (joint Army, Navy, Air Force publication) and ACP (allied communica- tions publication) series. In the case of conflict between NTP 4 and the JANAP/ACP series, NTP 4 will govern for intra—U.S. Navy use. NTP 4 furnishes the instructions for the employment of all phases of naval communication on both the command and operator levels. Additional instructions for joint operations are contained in JANAPs, while the ACPs contain instructions for the proper use of communication in joint, allied, and combined operations. Although there are many JANAP/ACP publications, the publications that contain the final word about communication procedures are the JANAP/ACP 121 through 134 series. They are known as the communications instructions group. Specifically, ACP 129, Communication Instruc- tions, Visual Communication Procedures; ACP 121, Communication Instruction, General Procedures; and ACP 125, Communication Instructions, Radiotele- phone Procedure, should be thoroughly understood by signal bridge personnel. The Allied Maritime Tactical Signal Book, ATP 1, volume II, is a NATO restricted publication supplied to naval vessels. It contains maneuvering signals, standard operational signals, and the more common administrative signals. A thorough knowledge of the instructions in chapter 1 is a must for all Signalmen. NTP 13, Flags, Pennants, and Customs, is an excellent source of information on all matters concerning flags and pennants. The International Code of Signals, Pub 102, contains signals for use with merchant vessels of all nationalities. A knowledge of the instructions in the front of this pub is also a must for all Signalmen. Pub 102 also contains the Incidents On and Over the High Seas (INCSEA) agreement. This agreement between the U.S. and former Soviet countries helps to avoid the risk of collision at sea ACP 131, Communication Instructions, Operating Signals, and ACP 168, Pyrotechnic Signals, also contain valuable information for visual communicators. You should also familiarize yourself with the uses and contents of the following joint call sign books: ACP 113, Call Sign Book for Ships ACP 100 Series, U.S./Allied Call Sign and Address System JANAP 119, Joint Voice Call Sign Book OBTAINING PUBLICATIONS These publications and most corrections and changes, with the exception of Pub 102, which is distributed by the Defense Mapping Agency Hydrographic Center (DMAHC), are made available to you through the technical publications librarian or the registered publications custodian. PUBLICATION CORRECTIONS AND CHANGES As a Signalman, you should be faniliar with the system used for making corrections and changes to publications. Each correction or change to a publication will have instructions for making the correction included in it. These instructions adequately describe the procedure to use. Read and thoroughly understand the instructions before you make the actual entry. Since communications are in a constant state of flux, governing documents are subject to frequent changes. Unless otherwise stated, these changes are to be entered immediately, and the appropriate record sheet annotated. If new pages have been inserted, the publication must be thoroughly page checked. Recommended changes to NTPs may be submitted using a feedback report (fig. 1-6). Changes of an urgent nature may be submitted by message. Correspondence regarding proposed changes to communications publications is submitted through the normal chain of command to the cognizant authority of the publication (found in the letter of promulgation). Never use red ink when entering corrections. Normally, the only type of light you will use at night on the bridge is a red light. This light would render the red ink invisible, and you would be unable to read the 1-6