1.1 Members connecting to the VATSIM network should use the following callsign naming convention for the ATC positions in VATCAR airspace: Three or four-letter ICAO/FAA code (for Airport or Facility), followed by the three-letter ATC callsign suffix (as applicable).
1.2 The following ATC callsign suffixes are authorized for use:
_OBS – used by all members connecting as observers (LISTENING ONLY)
_DEL – used by all members connecting as a Clearance Delivery controller
_GND – used by all members connecting as a Ground controller
_TWR – used by all members connecting as a Local/Tower controller
_APP – used by all members connecting as an Approach controller
_DEP – used by all members connecting as a Departure controller
_CTR – used by all members connecting as an En Route/Center controller
_FSS – used by all members connecting for oceanic sectors or the Caribbean Flight Service Station
_SUP – used by VATSIM network supervisors only
1.3 Identification initials may also be used when connected to the VATSIM network, placed between the ICAO codes and callsign suffixes, to provide additional information. The following ID initials are authorized for use:
_XX_ – signifying the operator’s initials when connecting as an observer
_I_ – used by instructors while actively instructing on the network
_I_ – may also be used by informational towers (AFIS) (reserved for events only)
_M_ – used by mentors while actively mentoring on the network
_L_ – used by students when solo endorsed to work a position on the network
_S_ or _T_ – used by students working with an instructor/mentor on the network
1.4 VATCAR staff members logged on to VATSIM for an official operating capacity shall use their staff callsign and designated staff number: VATCAR[number]
NOTE – Individual FIRs may combine _APP and _DEP. The primary/secondary positions are at the discretion of the ATM.
NOTE – The Flight Service Station requires additional training and qualifications.