Google Earth Tutorial - Using Look Joystick

Look Joystick(Middle Mouse Button):  The Look Joystick allows you to rotate the orbit of your viewport so that you can look at the same point from different angles. You can also do this by pressing the scroll on the mouse and move the cursor in the required direction. The N on top of the joystick represents the north. While moving around the orbit, you can observe that, the N moves around the orbit. You can simply double click on the N to get the orbit back to its original position.