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. Instrument Flight Rules (IFR) Enroute High Altitude Chart for the Conterminous U.S. 20 Miles/Inch. Instrument Flight Rules (IFR) Enroute High Altitude Chart for Alaska Varies from 18 to 45 Miles/Inch