In aviation (particularly in air navigation) lowest safe altitude (LSALT) is an altitude that is at least 1,000 feet above any obstacle or terrain within a defined safety buffer region around a particular route that a pilot might fly. The safety buffer allows for errors in the air by including an additional area that a pilot might stray into by flying off track. By flying at or above this altitude a pilot complies with terrain clearance requirements on that particular flight leg.
Read more about Lowest Safe Altitude: Australian Definition, FAA Definition
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