Definition
The electronic data files used by GPS receivers, flight management systems, and other onboard navigation equipment that contain information about airports, runways, navigation aids, airways, waypoints, instrument procedures, and airspace boundaries. These databases are issued by the manufacturer or a data provider and are updated on a regular cycle so that the navigation equipment reflects current published procedures and facilities.
Plain English
The data files inside a GPS or navigation unit that tell it where airports, runways, waypoints, and procedures are. Pilots can update these files themselves as part of preventive maintenance.
Context Anchor
Seen when a pilot or owner updates the database in a panel-mounted GPS or navigation unit as an allowed preventive maintenance task.
Derivation
Navigational comes from the Latin navigare, to sail or steer a ship. A database is simply an organized collection of stored information. Together the term names a stored collection of steering information — the digital equivalent of the paper charts and approach plates pilots used to carry.
Why Pilots Care
Outdated databases can cause navigation errors or regulatory non-compliance during flight operations.
Analogy
It is similar to updating the map data in a car or phone navigation app. The device may still turn on with old data, but the route information may no longer match the real system you are using.
Intuition Check
Do not read “software databases” as the whole navigation program. Here it means the stored navigation information used by the equipment, not the entire operating system of the unit.
Example Sentence 1
Before the cross-country, the pilot loaded the latest navigational software database update onto the GPS so the new approach into the destination airport would be available.
Example Sentence 2
Preventive maintenance includes checking the expiration dates on the navigational software databases installed in the avionics.