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Features August 2013 Issue

Obstacle Clearance

If approaches with vertical guidance are better than those without, how can some LNAVs take you lower than the LNAV/VNAV for the same procedure?

When we think of GPS-based instrument approaches, we usually lump all the approach minima into a single “GPS approach” bucket. We tend to mentally order the types with WAAS as better than non-WAAS, and vertical guidance better than those without. After all, that’s how the magic box picks the type of service to provide. …

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