If the aircraft velocity message indicates a supersonic subtype (2 or 4), multiply the derived velocity by four. This is in accordance with ICAO document 9871 Technical Provisions for Mode-S Services and Extended Squitter table A-2-9a (velocity over ground) and table A-2-9b (airspeed and heading).
If the aircraft velocity message indicates a supersonic subtype (2 or 4), multiply the derived velocity by four. This is in accordance with ICAO document 9871 Technical Provisions for Mode-S Services and Extended Squitter table A-2-9a (velocity over ground) and table A-2-9b (airspeed and heading).