Table of Contents Chapter 1. Air Navigation Section 1. Navigation Aids 1-1-1. General 1-1-2. Nondirectional Radio Beacon (NDB) 1-1-3. VHF Omni-directional Range (VOR) . 1-1-4. VOR Receiver Check 1-1-5. Tactical Air Navigation (TACAN) 1-1-6. VHF Omni-directional Range/Tactical Air Navigation (VORTAC) . 1-1-7. Distance Measuring Equipment (DME) 1-1-8. Navigational Aid (NAVAID) Service Volumes . 1-1-9. Instrument Landing System (ILS) 1-1-10. Simplified Directional Facility (SDF) 1-1-11. NAVAID Identifier Removal During Maintenance 1-1-12. NAVAIDs with Voice . 1-1-13. User Reports Requested on NAVAID or Global Navigation Satellite System (GNSS) Performance or Interference . 1-1-14. LORAN 1-1-15. Inertial Reference Unit (IRU), Inertial Navigation System (INS), and Attitude Heading Reference System (AHRS) 1-1-16. Doppler Radar . 1-1-17. Global Positioning System (GPS) . 1-1-18. Wide Area Augmentation System (WAAS) . 1-1-19. Ground Based Augmentation System (GBAS) Landing System (GLS) 1-1-20. Precision Approach Systems other than ILS and GLS 1-1-1 1-1-1 1-1-1 1-1-3 1-1-4 1-1-4 1-1-5 1-1-5 1-1-8 1-1-13 1-1-15 1-1-15 1-1-15 1-1-16 1-1-16 1-1-16 1-1-16 1-1-29 1-1-34 1-1-35 Section 2. Performance-Based Navigation (PBN) and Area Navigation (RNAV) 1-2-1. General 1-2-2. Required Navigation Performance (RNP) . 1-2-3. Use of Suitable Area Navigation (RNAV) Systems on Conventional Procedures and Routes 1-2-4. Pilots and Air Traffic Controllers Recognizing Interference or Spoofing 1-2-1 1-2-4 1-2-7 1-2-9 Chapter 2. Aeronautical Lighting and Other Airport Visual Aids Section 1. Airport Lighting Aids Approach Light Systems (ALS) Visual Glideslope Indicators Runway End Identifier Lights (REIL) Runway Edge Light Systems In-runway Lighting . Runway Status Light (RWSL) System . StandAlone Final Approach Runway Occupancy Signal (FAROS) Control of Lighting Systems . Table of Contents 2-1-1 2-1-1 2-1-6 2-1-6 2-1-6 2-1-7 2-1-10 2-1-11