Structure storing details related to navigation.
| defaultNavigation | Return a Navigation with sensible default values. | 
| mode | Navigation mode. | 
| selectOnDown | Specify a Selectable UI GameObject to highlight when the down arrow key is pressed. | 
| selectOnLeft | Specify a Selectable UI GameObject to highlight when the left arrow key is pressed. | 
| selectOnRight | Specify a Selectable UI GameObject to highlight when the right arrow key is pressed. | 
| selectOnUp | Specify a Selectable UI GameObject to highlight when the Up arrow key is pressed. |