Plain English Meaning
A cockpit display that draws a realistic picture of the world outside — hills, runways, and the airplane's path through the sky — using stored map data and the airplane's position. Because the picture gives the pilot a much clearer mental view of what's around them, regulators allow approaches to be flown in slightly worse weather than normal.
Full Definition
An advanced cockpit display system that presents a computer-generated, three-dimensional image of the surrounding terrain, obstacles, runways, and flight path on the primary flight display, derived from onboard databases combined with GPS position, attitude, and heading data. When for credit, SVGS allows certain to be flown to lower than would otherwise be , by providing the pilot with equivalent to improved .