All following commands can zoom nearer with the Shift-key. If then the width of the area visible in the window is more than constant given in the zoom settings, zooming level is changed to this constant value.
Centers zooming to the active point.
Activate previous point in the file and center zooming to it.
Activate next point in the file and center zooming to it.
Center current GPS position. If the 3D-zooming is on, sets also current direction to north.