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GRID MINIMUM OFFROUTE ALTITUDE
GRID MINIMUM OFFROUTE ALTITUDE (Grid MORA): An altitude derived by Jeppesen or provided by State Authorities. The Grid MORA altitude provides terrain and man-made structure clearance within the section outlined by latitude and longitude lines. MORA does not provide for navaid signal coverage or communication coverage.
Grid MORA values derived by Jeppesen clear all terrain andman-made structures by 1000 feet in areas where the highest elevations are 5000 feet MSL or lower. MORA values clear all terrain and man-made structures by 2000 feet in areaswhere the highest elevations are 5001 feet MSL or higher. When a Grid MORA is shown as “Unsurveyed” it is due to incomplete or insufficient information. Grid MORA values followed by a +/- denote doubtful accuracy, but are believed to provide sufficient reference point clearance.
GridMORA (State) altitude supplied by the State Authority provides 2000 feet clearance in mountainous areas and 1000 feet in non-mountainous areas.
source: ICAO Aviation Chart Glossary
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