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Callsigns Operators on 81FM use callsigns approved by the MSA. The callsigns are usually numerical, prefixed by an abbreviation of the name of the club to which the user belongs. A callsign is allocated to an individual and is used by that person at all times. So, it is those calls, not ones relevant to their location or the event, which the operators use. Because callsigns are not location specific it is obviously very important that the controller knows the relationship between callsign and location of radio car. To make life a bit easier for the controllers there are some exceptions to the callsign system. Some clubs hold callsigns that aren't allocated to individuals but are allocated by the club to operators at specific locations on an event. For example, one club (British Rally Marshals Club) uses the callsigns 'Jupiter 1' and 'Jupiter 2' for the start and finish cars regardless of the operators' own calls. Senior officials, regardless of any individual callsigns any of them may have, commonly use the prefix 'Pilot', with alpha or numeric callsigns. All doctors' callsigns, which are numeric, have the prefix 'Momo'. Rescue units and Recovery units, prosaically but functionally, use callsigns 'Rescue' and 'Recovery' prefixed with their relevant identifier.
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