Definition
An organized, electronically stored collection of aviation information — such as airport data, navigation aids, airways, waypoints, terrain, obstacles, and procedures — that is loaded into onboard avionics (GPS units, flight management systems, electronic flight bags) and used by those systems to display charts, plan routes, and provide navigation guidance. Aviation databases are issued on a fixed update cycle (commonly every 28 days) and must be current to be used for certain operations.
Plain English
A package of aviation information stored inside your navigation equipment. The unit reads from this stored information to show you airports, airways, and procedures. It needs to be kept up to date because the real-world information it represents changes regularly.
Context Anchor
Encountered during preflight checks of navigation equipment, especially when confirming that stored flight information is up to date before departure.
Derivation
From 'data' (information) plus 'base' (a foundation or store). A database is literally a stored base of information that a system draws from when it needs to look something up.
Why Pilots Care
An expired or incorrect database can cause the navigation system to display outdated or missing procedures, leading to route deviations or approach errors.
Intuition Check
Do not read database as just any list of facts. In this context, it usually means the stored flight information used by aircraft electronic equipment, and it may need to be checked to make sure it is up to date.
Example Sentence 1
Before the IFR flight, the pilot confirmed the GPS database was current and would not expire mid-trip.
Example Sentence 2
The GPS prompted the pilot to update the database before it would allow an instrument approach to be loaded.