The reconfiguration of chart coverage includes an increase in the number of charts in the series from 28 to 36. This will result in a larger scale for each chart. The change is necessary to provide space for the addition of RNAV Routes and supporting RNAV data. The benefit to you will be improved readability, a less cluttered depiction of aeronautical information, and a more logical alignment of charts. For additional chart reconfiguration information, including a copy of the new chart index and a chart coverage conversion table (old vs. new), please visit

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

Airways

Limits of controlled airspace

VHF radio aids to navigation (frequency, identification, channel, geographic coordinates)

Airports that have an Instrument Approach Procedure or a minimum 3000' hard surface runway

Off Route Obstruction Clearance Altitudes (OROCA)

Reporting points

Special use airspace areas

Military Training Routes

Area Charts, which show congested terminal areas at a large scale, are included with subscriptions to any conterminous U.S. Set Low (Full set, East or West sets). Chart L-28 covers the Washington-Boston corridor at a scale similar to an Area Chart. Charts are revised every 56 days