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PART 1 − GENERAL
PART 2 − EN ROUTE
PART 3 − AERODROMES
Appendix 1. FAA Form 7233-4 - International Flight Plan
ATPUBS
EN ROUTE
NAVIGATION AIDS/SYSTEMS
ENR 4. NAVIGATION AIDS/SYSTEMS
ENR 4.1
Navigation Aids – En Route
ENR 4.1, Paragraph 1, Nondirectional Radio Beacon (NDB)
ENR 4.1, Paragraph 2, VHF Omni-directional Range (VOR)
ENR 4.1, Paragraph 3, VOR Receiver Check
ENR 4.1, Paragraph 4, Distance Measuring Equipment (DME)
ENR 4.1, Paragraph 5, Tactical Air Navigation (TACAN)
ENR 4.1, Paragraph 6, Instrument Landing System (ILS)
ENR 4.1, Paragraph 7, Compass Locator
ENR 4.1, Paragraph 8, ILS Frequency
ENR 4.1, Paragraph 9, ILS Minimums
ENR 4.1, Paragraph 10, Inoperative ILS Components
ENR 4.1, Paragraph 11, ILS Course and Glideslope Distortion
ENR 4.1, Paragraph 12, Continuous Power Facilities
ENR 4.1, Paragraph 13, Simplified Directional Facility (SDF)
ENR 4.1, Paragraph 14, LORAN
ENR 4.1, Paragraph 15, Inertial Reference Unit (IRU), Inertial Navigation System (INS), and Attitude Heading Reference System (AHRS)
ENR 4.1, Paragraph 16, Global Positioning System (GPS)
ENR 4.1, Paragraph 17, Wide Area Augmentation System (WAAS)
ENR 4.1, Paragraph 18, Ground Based Augmentation System (GBAS) Landing System (GLS)
ENR 4.1, Paragraph 19, Precision Approach Systems Other than ILS and GLS
ENR 4.1, Paragraph 20, Area Navigation
ENR 4.1, Paragraph 21, NAVAID Identifier Removal During Maintenance
ENR 4.1, Paragraph 22, User Reports Requested on NAVAID Outages
ENR 4.1, Paragraph 23, Radio Communications and Navigation Facilities
ENR 4.2
Special Navigation Systems
ENR 4.2, Paragraph 1, Doppler Radar