Plain English Meaning

A flight computer that listens to several different navigation sources at once and combines their information so it always has the best possible picture of where the aircraft is.

Full Definition

A flight management system that draws position and navigation data from more than one source — typically GPS, inertial reference, and ground-based radio aids such as VOR/DME — and blends them to produce a single, continuously updated aircraft position and flight plan solution.

Context Anchor

Seen in instrument flying, especially when discussing airborne navigation databases, procedure loading, and how the aircraft’s determines position.