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Aviation Learning Center Document GPS Approach Minima - How Low Can You Go?
Author: Martin Heller Date: July 2006
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The Local Area Augmentation System (LAAS) will augment the GPS and complement WAAS by providing an all-weather approach, landing, and surface navigation capability. It is expected that the end-state configuration will pinpoint the aircraft's position to within one meter or less. Curved approach paths, not possible using the current instrument landing systems, will be possible for Category I, II, and III precision approaches as the system evolves. Increased accuracy will allow more arrival and departure procedures. Approaches will be designed to avoid obstacles, restricted airspace, noise sensitive areas, or congested airspace. Similar to WAAS, LAAS works by monitoring the GPS signal, but in the case of LAAS, sends corrections directly to the aircraft. This not only provides greater integrity but also much quicker alerting.

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