The Garmin GMI 20 Marine Instrument Display is perfectly designed for both power and sail vessels. Designed to clearly show depth, speed, wind and 100+ marine and vessel parameters, its large, bright 4" color display with extra large digits is easy to read at a distance and 170 degree viewing angle. The Garmin GMI 20 Marine Instrument Display w/ Color Glass Lens includes a glass-bonded finish lens that prevents fogging and increases contrast. Daylight readability is enhanced with a high contrast color scheme. For enhanced night visibility, you have a choice of red/black, green/black or the normal night mode color scheme along with a dimmer control. Screens can be set to auto-scroll, cycling between pages automatically without your having to do a thing. Default profiles can be customized for powerboat, sailboat, fishing, engine/fuel, plus several other user-specified profiles. In addition, the Garmin GMI 20 Marine Instrument Display w/ Sun Cover also features a dedicated race timer that counts down and counts up, with an internal beeper. Included are 2 trim snap piece cover options which allow you to match the Garmin GMI 20 Marine Instrument Display for Day & Night with the new GPSMAP 500/700 series, GPSMAP 8000 Glass Helm series or legacy Garmin chartplotters.