Hold to turn on and off the device.

Press repeatedly to scroll through the backlight brightness levels.

Turn to zoom in or out of a view.

Turn to highlight an option in a menu.

Press to select a highlighted option.

Press to open to the home screen.

Press to open or close a menu of options for a page.

Press to move a highlight to a different section of a page.

Press to move a highlight to a different function or window on a combination page.

Press to pan on a chart or sonar screen.

Press to move the cursor.

Press to highlight an option in a menu.

Press to return to the previous screen.

Press to acknowledge messages and select options.

Press to open the Where To menu and access navigation features.

Press to save the present location as a waypoint.

Hold for one second to mark an SOS location and begin a route back to the location.

Hold to create a shortcut to the selected feature button.

Press to open the assigned feature.