The GHC 20 autopilot helm controller is compatible with newer Garmin autopilots as well as legacy models on both power and sail vessels. It’s large, bright 4-inch color display is easy to read at a distance and 170 degree viewing angle. Glass-bonded anti-glare lens 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.