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In addition, a suffix following the initial call sign can denote a specific individual or grouping within the designated call sign, so F13C would be the Charlie fire team. Unused suffixes can be used for other call signs that do not fall into the standard call sign matrix, for example the unused 33A call sign is used to refer to the Company ...
Russian nuclear icebreaker Arktika with call sign UKTY. Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, e.g. 3LXY2).
Aviation call signs or aircraft call signs are communication call signs assigned as unique identifiers referring to an aircraft. Call signs in aviation are derived from several different policies, depending upon the type of flight operation and whether or not the caller is in an aircraft or at a ground facility.
Call sign information for U.S. stations are set out in chapter I of the FCC rules, Title 47 (Telecommunication) of the Code of Federal Regulations (C.F.R.): 47 CFR 2.302: General overview of call sign assignments, including a detailed summary of standards and practices for various license classes.
DUSTOFF: a now traditional call sign for US Army Air Ambulance helicopter operations engaging in MEDEVAC. Echelon formation: a military formation in which members are arranged diagonally. Encirclement: surrounding enemy forces on all sides, isolating them.
Aviator call signs nearly always must come from a member or members of the aviator's squadron, training class, or other cohort. It is considered bad form to try to give oneself a call sign and it is also common for aviators to be given a fairly derogatory call sign, and the more they complain about it, the more likely it is to stick.
Aircraft position within a flight. Use if specific call sign is unknown. Data Standby for improved data modem (IDM) data message concerning (object) at stated location. Datum Last known position of a submarine contact after contact was lost. Deadeye Informative call by an airborne laser designator indicating the laser/IR system is inoperative ...
The rules governing call signs for stations in the United States are set out in the FCC rules, 47 C.F.R. chapter I. Specific rules for each particular service are set out in the part of the rules dealing with that service. A general overview of call sign formats is found at 47 CFR 2.302.