You can swipe down from the top of the screen to open the controls panel. The options in the controls panel are highlighted when they are turned on.

Stealth

Select to turn off AIS transmissions (Garmin Signal™ VHF 400 only) and ignore DSC position requests (Turning Off Position Reports).

Alarms

Select to silence AIS collision alarms (AIS Alarms).

Night

Select to set the screen to night mode.

Intercom

Select to open the intercom screen (Intercom).

Alerts

Select to view system-related alerts.

Display Brightness

Touch the bar or turn the dial to change the brightness of the screen.