Part 1 GENERAL (GEN)
Part 2 EN-ROUTE (ENR)
+ENR 0 INTRODUCTION
+ENR 1 GENERAL RULES AND PROCEDURES
+ENR 2 AIR TRAFFIC SERVICES AIRSPACE
+ENR 3 ATS ROUTES
+ENR 4 RADIO NAVIGATION AIDS / SYSTEMS
+ENR 5 NAVIGATION WARNINGS
+ENR 6 EN-ROUTE CHARTS