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The Runway Awareness and Advisory System (RAAS) is one of a number of related software enhancements available on later-model Enhanced Ground Proximity Warning Systems. RAAS is designed to improve flight crew situational awareness, thereby reducing the risks of runway incursion, runway confusion and runway excursions. Runway Awareness and Advisory System uses airport data stored in the EGPWS database, coupled with GPS and other onboard sensors, to monitor the movement of an aircraft around the airport. It provides visual/aural annunciations at critical points, such as "Approaching Runway 09 Left and confirmation when an aircraft is lined up on the runway prior to takeoff: for example, "On Runway 09 Right, 2,450 metres remaining." In a scenario where a crew inadvertently lines up on a parallel taxiway and commences a take off, an aural alert “On Taxiway, On Taxiway” is provided if the aircraft speed exceeds 40 kts. On approach and after touchdown, the system continues to announce the distance to go until the en