Canada, USA, the UK, and Australia developed a system of station designators for their SIGINT stations. These designators were used for ease of reference on logs and reports and the format was as follows:
Two letters for the country, ( ie US, UK, CA, AU) followed by a letter indicating the service: N for Navy, M for Army, A for Air Force, and F for Joint Services. The designators did more than merely indicating which station had taken a given HFDF bearing or made an intercept. When plotters and traffic analysts used the information, they would only have to consult a list of stations to determine potential validity or utility of bearings. If necessary, these designators could be located on charts to determine the station's proximity to target areas.
An example in the UK would be GCRE Knockholt which bore the designation UKF100 The abbreviation meant Government Communications Research Establishment; Knockholt , It was also known as the FORDE Ivy Farm (Foreign Office Research and Development Establishment) and was notable for its non-morse intercepts during WWII. The RN station at Scarborough near Scotland was UKN125.
In Canada, RCN stations were assigned CAN prefixes, Army stations (Ladner, Leitrim) were CAM and Air Force (Whitehorse) were CAA.
STATION DESIGNATOR STATION DESIGNATOR STATION DESIGNATOR Aklavik CAN92 Alert CAX1  Bermuda ?? Chimo CAN94 Churchill CAN99  Coverdale CAN96 Frobisher Bay CAN94  Gander CAN90 Gloucester CAN97 Inuvik CAN92  Ladner/VWS CAM93 Leitrim CAM98 Masset CAN91 Whitehorse CAA95
 In the test period prior to September 1958, Alert was CAX1 and Resolute was CAX2. When Resolute was closed and Alert was chosen as the High Arctic station, Alert retained the CAX1 designator until the Armed Forces Unification in 1968 at which time all designators became CAFxx. In the 1990's, a numerical designator was assigned to Alert but its not known at this time.
For purposes of logistics and transportation in the experimental period prior to September 1958, Resolute Bay was referred to as "Alto Near" and Alert was "Alto Far".
 When Chimo closed down, its station designator was passed on to Frobisher Bay.
 When Aklavik closed down, its station designator was passed on to Inuvik.
 Re-issued to CDSE. See below.
Doug Stewart adds. "These station designators, were in fact SIGINT designators to be used with the SIGINT product reports and applied only to SIGINT communications networks. With the advent of the Armed Forces Unification, the individual station prefixes changed to CAF. When Maritime Command (Marcom) formed Cryptologic Direct Support Elements (CDSE) within The Fleet there became a requirement for a SIGINT designator so that CDSE could function with USN and RN cryptologic commands. At that time Churchill had closed. At my suggestion, Churchill's previous designator CAF99 was subsequently approved for CDSE usage.
When I was directing the CDSE deployments, we generally employed a single ship as CAF99. On the deployment where we employed a second ship, that ship was designated CAF99A. In our early days we also shared the USN SIGINT comms thereby allowing us to solicit technical support. The primary purpose of CDSE was tactical support to the Task Force. The USN also used those initials and figure designator. Had CDSE existed prior to Unification, we would have probably employed CAN followed by a number".
Credits and References:
1) Ray White <legerwhite(at)rogers.com>
2) Don Bowman
3) Earle Smith - VE6NM <ve6nm(at)rac.ca>
4) Douglas Stewart <dougjoy(at)ns.sympatico.ca>
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