Minimum sector altitude
urn:aero:airm:1.0.0:ContextualModel:ATMBusinessTerms:Minimum_sector_altitude
The lowest altitude which may be used which will provide a minimum clearance of 300 m (1 000 ft) above all objects located in an area contained within a sector of a circle of 46 km (25 NM) radius centred on a significant point, the aerodrome reference point (ARP) or the heliport reference point (HRP).
Source:
ICAO
Abbreviations:
MSA