Australian Definition
- The minimum LSALT is 1500 feet.
- LSALT is 1360 feet above the highest obstacle which is less than 360 feet above the terrain.
- LSALT is 1000 feet above the highest obstacle which is greater than 360 feet above the terrain.
For example, if there is an obstacle at 200 feet above terrain of 2500 feet, LSALT is 2700 feet (obstacle height) + 1360 feet (clearance height), or an LSALT of 4060 feet; if there is an obstacle at 450 feet above terrain of 3600 feet, LSALT is 4050 feet (obstacle height) + 1000 feet (clearance height), or an LSALT of 5050 feet.
The differences in the clearance heights for obstacles is due to the potential for unreported obstacles up to 360 feet which are not marked on maps or charts.
The determination of which is the highest obstacle along the flight path depends on the method of navigation (radio navigation aid, dead reckoning or area navigation systems) and on the flight rules (instrument or night VFR)
Read more about this topic: Minimum Safe Altitude
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