Scrolls the map, or moves the cursor.
Performs the selected function.
Zooms in or out the navigation map.
Displays Main menu.
Displays previous screen.
Displays the current position.
Displays Route Option menu.
Switches between 2D and 3D map displays.
Plays Voice guidance.
Switches between the heading up navigation and
north up navigation map displays.
When a call comes in, it answers the call.