Definition
In avionics, the amount of digital memory available in a unit such as a GPS navigator or flight management system to hold databases, flight plans, user waypoints, and other data. Measured in bytes (kilobytes, megabytes, gigabytes), it determines how much information the unit can carry at one time and limits how large or detailed loaded databases can be.
Plain English
How much information the avionics unit can hold in its memory at one time.
Context Anchor
Seen when discussing avionics databases, software updates, and whether a navigator can hold the needed procedure or data for a flight.
Derivation
“Storage” comes from “store,” meaning to keep something for later use. “Capacity” comes from a Latin root meaning “to hold.” Together, the words point to how much information a system can keep available for use.
Why Pilots Care
If the unit's storage capacity is too small for the current navigation database, parts of the database may be missing or the update may not load. Knowing the capacity helps pilots and shops choose the right equipment and avoid surprises during database cycles.
Analogy
It is like the memory on a phone: if there is not enough room, the device cannot hold every app, map, or file you might want.
Intuition Check
Storage capacity does not mean baggage space or physical room in the aircraft. In this context, it means how much electronic information the avionics equipment can hold.
Example Sentence 1
The new GPS navigator has enough storage capacity to hold both the U.S. and Canadian navigation databases at the same time.
Example Sentence 2
Insufficient storage capacity prevented the unit from accepting the full set of approach charts for the trip.