Part 2 – En Route (ENR) ▶ ENR 0 ENR 0.1: Table of Contents to Part 2 ▶ ENR 1: General Rules and Procedures ENR 1.1: General Rules ENR 1.2: Visual Flight Rules ENR 1.3: Instrument Flight Rules ENR 1.4: ATS Airspace Classification ENR 1.5: Holding, Approach, and Departure Procedures ENR 1.6: ATS Surveillance Services and Procedures ENR 1.7: Barometric Altimeter Errors and Setting Procedures ENR 1.8: Cold Temperature Barometric Altimeter Errors, Setting Procedures, and Cold Temperature Airports (CTA) ENR 1.9: Air Traffic Flow Management and Airspace Management ENR 1.10: Flight Planning (Restriction, Limitation or Advisory Information) ENR 1.11: Addressing of Flight Plans for Domestic or International Flight Planning ENR 1.12: National Security and Interception Procedures ENR 1.13: Unlawful Interference ENR 1.14: Air Traffic Incidents ENR 1.15: Medical Facts for Pilots ENR 1.16: Performance-Based Navigation (PBN) and Area Navigation (RNAV) ▶ ENR 2: Air Traffic Services Airspace ENR 2.1: FIR, UIR, TMA and CTA ▶ ENR 3: ATS Routes ENR 3.1: Lower ATS Routes ENR 3.2: Upper ATS Routes ENR 3.3: Area Navigation (RNAV) Routes ENR 3.4: Helicopter Routes ENR 3.5: Other Routes ENR 3.6: En Route Holding ▶ ENR 4: Navigation Aids/Systems ENR 4.1: Navigation Aids - En Route ENR 4.2: Special Navigation Systems ENR 4.3: Global Navigation Satellite System (GNSS) ENR 4.4: Name-Code Designators for Significant Points ENR 4.5: Aeronautical Ground Lights — En-Route ▶ ENR 5: Navigation Warnings ENR 5.1: Prohibited, Restricted, and Other Areas ENR 5.2: Military Exercise and Training Areas ENR 5.3: Other Activities of a Dangerous Nature and Other Potential Hazards ENR 5.4: Air Navigation Obstacles ENR 5.5: Aerial Sporting and Recreational Activities ENR 5.6: Bird Migration and Areas ▶ ENR 6: Helicopter Operations ENR 6.1: Helicopter IFR Operations ENR 6.2: Special Operations ▶ ENR 7: Oceanic Operations ENR 7.1: General Procedures ENR 7.2: Data Link Procedures ENR 7.3: Special Procedures for In-Flight Contingencies in Oceanic Airspace ENR 7.4: Operational Policy 50 NM Lateral Separation ENR 7.5: Operational Policy Performance-Based Navigation (PBN) and Performance-Based Communication and Surveillance (PBCS) ENR 7.6: North Atlantic (NAT) Route Clearance Procedures ENR 7.7: North Atlantic (NAT) Timekeeping Procedures ENR 7.8: North Atlantic (NAT) Safety Information ENR 7.9: Y-Routes ENR 7.10: Atlantic High Offshore Airspace Offshore Routes Supporting Florida Airspace Optimization ENR 7.11: Reduced Separation Climb/Descent Procedures ENR 7.12: New York Oceanic Control Area (OCA) West Flight Level Allocation ENR 7.13: Gulf of America RNAV Routes Q100, Q102, and Q105 ▶ ENR 8: Unmanned Aircraft Systems (UAS) ENR 8.1: General ENR 8.2: Small Unmanned Aircraft System (sUAS) ENR 8.3: Large UAS (MGOW 55 Pounds Or More) ENR 8.4: Airspace Access for UAS ENR 8.5: UAS Pilot Testing, Certification and Responsibilities ENR 8.6: Advanced Air Mobility ENR 8.7: UAS Operations on Airports ENR 8.8: Other Information and Best Practices