MEA - Minimum Enroute Altitude
lowest altitude along the route that assures navigational signal coverage and obsticle clearance
MRA - Minimum Reception Altitude
lowest altitude to recieve navigational coverage
MCA - Minimum Crossing Altitude
Lowest altitude a fix can be crossed and continued on allowing to clear obsticles in normal climb
MOCA - Minimum OBstruction Clearance Altitude
Lowest altitude to clear obstacles and recieve VOR coverages within 22nm of a VOR
MAA - Maximum Altitude Altitude
Maximum usable altitude for airspace structure
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