Instrument Approach - Non-precision Approaches and Systems

Non-precision Approaches and Systems

  • Localizer
  • VOR – VHF Omnidirectional Range
  • NDB – Non-Directional Beacon with complementary Automatic Direction Finder (ADF) installed on board
  • LDA – Localizer Type Directional Aid
  • SDF – Simplified Directional Facility
  • GPS – Global Positioning System (with or without vertical navigation capability, which usually requires extra precision typically afforded by using WAAS, EGNOS, or other signal correction systems)
  • TACAN – Tactical Air Navigation
  • SRA – Surveillance Radar Approach (known in some countries as an ASR approach)
  • ASR – Airport Surveillance Radar (military designation for SRA)

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