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)
Read more about this topic: Instrument Approach
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