An off-route obstruction clearance altitude (OROCA) is an off-route altitude that provides obstruction clearance with a 1,000-foot buffer in non-mountainous terrain areas, and a 2,000-foot buffer in designated mountainous areas.

It can be found on US IFR low charts and VFR sectionals, as seen here.

1. “You Should Know These 10 Minimum IFR Altitudes” by BoldMethod

September 19, 2019 by Kyle Boas