The Garmin GNX 21 pairs a first-of-its-kind glass-bonded hybrid LCD with NMEA 2000 connectivity to deliver 50-plus vessel parameters on a crisp 4" inverted display. Digits scale to 36 mm tall for confident readability from bright sunlight to pitch darkness, while a miserly 25 mA draw makes it a natural fit for sailboats watching their amp budget. Five configurable layouts, seven backlight colors, and hands-free auto-scroll keep essential data — depth, wind, GPS speed, water temperature, and more — exactly where you need it.

Specifications:

• Display type: Inverted 4" glass-bonded hybrid LCD with anti-glare lens — white or color digits on a black background
• Digit height: Scalable up to 36 mm
• Backlight: 7 selectable colors plus a custom color option
• Display configurations: 5 layouts — single, dual, triple function, gauge, and graph mode
• Parameters supported: 50+ marine and vessel parameters including depth, speed, wind direction, wind speed, GPS speed, and water temperature
• User profiles: Fully customizable for sailboat or powerboat use
• Auto-scroll: Rotates through data pages at a user-defined interval for hands-free operation
• Power consumption: 25 mA; 350 mW (no backlight) / 400 mW (mid-level backlight)
• Connectivity: NMEA 2000 built-in; NMEA 0183 supported via optional 7-pin bare-wire power/data cable
• Mounting: Included low-profile flush mount; optional flat mount sold separately

In the Box:

• GNX 21 instrument
• Trim piece snap cover
• Protective cover
• Flush mount gasket and hardware
• NMEA 2000 T-connector
• NMEA 2000 drop cable
• Installation instructions
• Documentation

Note: This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.