Garmin GNX21 Marine InstrumentThe easy to read GNX 21 marine instrument features an inverted display with white or color digits on a black background, clearly showing depth, speed, wind, and more than 50 other marine and boat parameters. Its glass bonded display with anti glare lens coating provides excellent readability day and night, with high contrast digits scalable up to 36 mm. The GNX 21 is the first glass bonded marine instrument to combine directly driven LCD segments with