When the AeroNav Products en route chart is unfolded, the legend is displayed and provides information concerning airports, NAVAIDs, communications, air traffic services, and airspace.The en route charts are revised every 56 days.Information concerning MTRs is also included on the chart cover.The effective date of the chart is printed on the other side of the folded chart.
Also noted is an explanation of the off-route obstruction clearance altitude (OROCA).Cities near congested airspace are shown in black type and their associated area chart is listed in the box in the lower left-hand corner of the map coverage box.When folded, the cover of the AeroNav Products en route chart displays an index map of the United States showing the coverage areas.The IFR low altitude en route chart is the instrument equivalent of the sectional chart.To effectively depart from one airport and navigate en route under instrument conditions, a pilot needs the appropriate IFR en route low-altitude chart(s).Established jet routes from 18,000' MSL to FL 450 use NAVAIDs not more than 260 NM apart.Information includes the portrayal of Jet and RNAV routes, identification and frequencies of radio aids, selected airports, distances, time zones, special use airspace, and related information.En route high-altitude charts provide aeronautical information for en route instrument navigation at or above 18,000' MSL.AeroNav Products maintains and produces the charts for the U.S.Your ability to fly instruments safely and competently in the system is greatly enhanced by understanding the vast array of data available to the pilot on instrument charts.The objective of IFR en route flight is to navigate within the lateral limits of a designated airway at an altitude consistent with the ATC clearance.
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