Plain English Meaning

The pre-loaded data files inside a navigation computer that tell it where airports, navaids, waypoints, and approach procedures are. The pilot selects items from this stored data instead of typing in raw coordinates.

Full Definition

Digital files loaded into avionics such as a flight management system (FMS) or GPS that contain coded information about waypoints, navigation aids, airways, airports, runways, instrument procedures, and related airspace data. These databases are the source the equipment uses to compute positions, build flight plans, and display , and they are issued on a 28-day to remain with published .