Acronyms and abbreviations in avionics Airspeed AN/CRN-2 Autoland Blind approach beacon system (BABS) CFIT Distance measuring equipment (DME) EGPWS Flight director, FD Fog George Vernon Holloman – the pilot who made first automated landing Global Positioning System (GPS) HUD Instrument flight rules (IFR) Local Area Augmentation System (LAAS) Localizer performance with vertical guidance (LPV) Lorenz beam Microwave landing system (MLS) Non-directional beacon (NDB) Precision approach radar (PAR) Space modulation Transponder landing system (TLS) Visual flight rules (VFR) VHF omnidirectional range (VOR) Wide Area Augmentation System (WAAS)