Solar storm or poor signal quality can force a downgrade past minimums.

The definition of a "precision approach" has practically expanded beyond ILS to include "APV" (Approach with Vertical guidance) like LPV, which offers surveyed vertical guidance and often superior ...

Everyone knew it was coming, but the oft-delayed entry of the wide area augmentation system into the world of GPS is still somewhat startling in its potential. At the very least, WAAS promises more ...

Controlled flight into terrain (CFIT) is a continuing problem area for aviation safety. Many CFIT accidents occur in the approach-and-landing phase - and non-precision approaches, those without ...