IFR Enroute Low Altitude Charts
IFR Enroute Low Altitude Charts provide aeronautical information for navigation under instrument flight rules below 18,000 feet MSL. These four-color chart series includes:

• Air Traffic Services
• Airports that have an Instrument Approach Procedure or a minimum 3000' hard surface runway
• Airways/Route Data
• Crusing Altitudes
• Fixes/ATC Reporting Points
• Limits of controlled airspace
• Military Training Routes
• Off Route Obstruction Clearance Altitudes (OROCA)
• Radio aids to navigation
• RNAV Routes
• Special Use Airspace Areas
• Tabulations (MTRs, SUAs, MOAs, Airport data)

IFR Enroute High Altitude Charts
IFR Enroute High Altitude Charts (Conterminous U.S. and Alaska) are designed for navigation at or above 18,000 ft MSL. This four color series includes:

• Jet Route Structure
• RNAV Q-Routes
• VHF radio aids to navigation (frequency, ID, channel, geographic coordinates)
• Selected airports
• Reporting Points
• NRS (Navigation Reference System) Waypoints
• Revised every 56 days