According to ICAO, what is the lowest altitude that may be used which provides a minimum clearance of 300 m 1000 ft above all objects located in the area contained within a sector of a circle of 46 km (25 NM) radius centred on a radio aid to navigation?
ICAO Doc 8 168, Part I, Section 4 (Approach Procedures)
2.3 - Minimum sector altitudes or terminal arrival altitudes are established for each aerodrome and provide at least 300 m (1 000 ft) obstacle clearance within 46 km (25 NM) of the navigation aid, initial approach fix or intermediate fix associated with the approach procedure for that aerodrome.
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