Garmin GMI&trade; 20 Marine Instrument Display Marine instrument display clearly shows depth, speed, wind and 100+ marine and vessel parameters Large, bright 4" diagonal color glass-bonded lens display with anti-glare finish Easy to read from a distance and 170 degree viewing angle Enhanced nighttime readability with backlight dimmer and full color or new red/black or green/black color schemes Enhanced daylight readability with new high contrast color option