Garmin GNX20 Marine InstrumentThe easy to read GNX 20 marine instrument display features black digits on a white or color background, clearly showing depth, speed, wind, and more than 50 additional marine and boat parameters. Its glass bonded display with an anti glare lens coating provides excellent readability in both daytime and nighttime conditions, with high contrast digits scalable up to 36 mm. The GNX 20 is the first glass bonded marine instrument to combine directly driven