Aviation Dictionary

Off-Route Obstruction Clearance Altitude (OROCA)

An off- route altitude that provides obstruction clearance with a 1,000-foot buffer in nonmountainous terrain areas and a 2,000-foot buffer in designated mountainous areas within the U.S. This altitude may not provide s…

Dictionary Term

Off-Route Obstruction Clearance Altitude (OROCA)

Definition

An off- route altitude that provides obstruction clearance with a 1,000-foot buffer in nonmountainous terrain areas and a 2,000-foot buffer in designated mountainous areas within the U.S. This altitude may not provide signal coverage from groundbased navigational aids, air traffic control radar, or communications coverage.

References

Instrument Procedures Handbook · Federal Aviation Administration · 2017