Manipulate the current viewpoint by rotating the object
using the mouse (press and hold down the middle mouse button then press
the left or right button and drag still holding down both buttons):
The viewpoint is not
snapped if you use the compass to manipulate the viewpoint.
Release the mouse buttons.
The viewpoint is adjusted and snapped to the
nearest standard view (Top View in our example) is
applied:
To deactivate viewpoint snapping, clear Viewpoint
Snapping in View > Navigation Mode.