Plain English Meaning

RNWY is just a shortened way of writing 'runway.' On the avionics screen, pressing the RNWY soft key brings up details about the runways at the airport you've selected.

Full Definition

A defined rectangular area on a land airport prepared for the landing and takeoff of aircraft, identified by a number based on its magnetic heading. On the Garmin Nearest Airports page, RNWY is a soft key that displays information about the runways at the selected airport, including length, width, surface type, and lighting.

Context Anchor

Seen on GPS or flight display soft keys, especially when viewing nearby airports during flight planning or while looking for a suitable place to land.