Enroute Charts - Low level The Enroute Chart (ERC) (L) is drawn to various scales to accommodate significant air traffic route areas and shows controlled airspace, prohibited, restricted and danger areas, air routes, ATS and radio-navigation services. Aeronautical information within Terminal areas may not be complete. Pilots should use a TAC or VTC. This chart is amended every 6 months.
Enroute Charts - High level The Enroute Chart (ERC) (H) is designed to provide selected information similar to that of the ERC (L) series and is primarily for use by aircraft operating on transcontinental and intercapital routes at FL200 and above. This chart is amended every 6 months.
