- aircraft information that contains: ICAO address, position,
altitude, velocity (ground speed), callsign, etc.
- aircraft information that contains: ICAO address, position, altitude, velocity (ground speed), callsign, etc.
- Mode-S Elementary Surveillance (ELS) (DF4 and DF5).
- DF4: Altitude
- DF5: Squawk code
- Mode-S Enhanced Surveillance (EHS) (DF20 and DF21). Additional information in response to SSR interrogation, such as: true airspeed, indicated airspeed, mach number, wind, temperature, etc.
- DF20: Altitude
- DF21: Squawk code
- BDS 2,0 Aircraft identification
- BDS 2,1 Aircraft and airline registration markings