The devices help pilots avoid "terrain" by coupling global-positioning technology with flight data on speed, altitude and other readings, and a database containing the topography of the planet.

FORBES: Cockpit Fight

And, because the GPS shows terrain regardless of the weather, it will also reduce flight delays.

BBC: The futurist: The US�� new air traffic control system

Flight instruments now warn pilots about potentially hazardous terrain and weather conditions.

NPR: For Air Travelers, More Safety and More Problems