this is the extract from FAA AIM whether right or wrong well it's not up to me to decide.
MINIMUM SECTOR ALTITUDE [ICAO] — The lowest altitude which may be used under emergency conditions which will provide a minimum clearance of 300m (1,000 feet) above all obstacles located in an area contained within a sector of a circle of 46 km (25 NM) radius centered on a radio aid to navigation. Go figure
