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