Definition
Electronic data files stored in onboard navigation equipment (such as GPS receivers and flight management systems) that contain coded information about waypoints, airways, navaids, airports, runways, instrument procedures, and related navigation reference data used by the aircraft to compute position, routing, and procedure guidance.
Plain English
A built-in digital library inside the aircraft's navigation equipment. It holds the location and details of airports, navigation aids, routes, and instrument procedures so the system knows where things are when the pilot selects them.
Context Anchor
You see this term when checking or loading information in a cockpit navigation unit before an instrument flight, especially before selecting a route or a published procedure.
Derivation
Airborne means carried by or operating in an aircraft. Database means an organized set of stored information. Together, the phrase means navigation information stored in the aircraft’s own equipment, not just information on a paper chart or in a ground-based computer.
Why Pilots Care
Using current airborne navigation databases is required for legal IFR operations and prevents the FMS from displaying incorrect or unsafe routing and approach data.
Intuition Check
Do not assume this means any navigation information available while flying. Here it means the specific loaded data set inside the aircraft’s navigation equipment, and that data must be current and suitable for the flight.
Example Sentence 1
Before the IFR flight, the pilot confirmed the airborne navigation database was current so the approach could legally be flown.
Example Sentence 2
An expired airborne navigation database prevented the aircraft from loading the expected RNAV approach.