SHIPS' BOATS.—The following visual call signs are assigned for ships' boats. Q p 0 Qp1 Qp2 Qp3 Qp4 Qp5 Qp6 Qp7 Qp8 ) ) ) All boats Admiral's  barge Chief of staff barge or gig Staff gigs or motorboats Captain's  gig Boats under power Boats under sail Boats under oars Reserved for local assignment by commanding officers. Calls are generated according to boat numbers. Qp5p0) Boat calls consist of QUEBEC hoisted above numeral pennant(s). Together, they signify the type of boat(s) called. Numeral flags following the call sign indicates the individual number of the boat. Thus, Qp54 is the call sign a ship would use for its utility boat number 4. To call another ship's boat, the call of the ship is hoisted below the boat call. For example, Qp4Rp1p4 is the captain's gig of carrier 14. ADDRESS GROUPS Address groups are four-letter groups assigned to represent  a  command,  activity,  or  unit.  Although address  groups  are  used  mainly  in  the  message address, they can be used in military communications to establish and maintain communications in the same manner as call signs. In general, call signs and address groups are used by the Navy in the same way. Address  groups  never  start  with  the  letter  N; hence, they are easily distinguishable from naval radio call signs. Unlike international call signs, address groups follow no distinctive pattern. For example, you learned the difference in call signs for naval ships and shore  stations.  In  address  groups,  however,  the arrangement of the four letters is not significant. All commands afloat (except individual ships) are assigned address groups. Address groups are assigned also   to   shore-based   commands,   authorities,   or activities not served by their own communication facilities.  More  specifically,  these  are  (1)  senior commands  and  commanders  ashore,  such  as  the Secretaries of Defense and of the Navy, bureaus and offices   of   the   Navy   Department,   and   district commandants;  (2)  fleet,  type,  or  force  commanders ashore;  (3)  elements  of  operating  forces  permanently ashore who are in frequent communication with forces afloat; and (4) elements of the shore establishment (such as weather centrals) having a need for direct addressing and receipt of the messages. Among  other  uses,  address  groups  aid  in  the delivery of messages when a communications center serves so many activities that its own call sign is insufficient to identify the addressee. Address groups, like call signs, are divided into types.   They   are   individual   activity,   collective, conjunctive,  and  geographic  address  groups,  and address  indicating  groups. Individual Activity Address Groups Individual  activity  address  groups  are  repre- sentative of a single command or unit, either afloat or ashore.  Examples: DTCI . . . . . . COMPHIBLANT SSMW . . . . . CNO Collective Address Groups Collective address groups represent two or more commands,   authorities,   activities,   units,   or combinations of these. Included in the group are the commander  and  subordinate  commanders.  Examples: DSWN.. . . . . DESRON 16 AMGK . . . . . . SIXTH FLT Conjunctive Address Groups Conjunctive  Address  Groups You must remember that conjunctive address groups  have  incomplete  meanings.  It  is  always necessary to complete the meaning by the addition of other address groups denoting a specific command or location.  For  that  reason,  conjunctive  address  groups are used only with one or more other address groups. The  conjunctive  address  group  XZKW,  for  example, means “All ships present at .” This particular group must be followed by a geographic address group to complete the meaning. Geographical  Address  Groups Geographic address groups should be included as a part of an address designator only when necessary to complete the titles of addressees or originators, in 3-16