I noticed rotations in India and Canada. Rotations are 90 degree clockwise & anti-clockwise and 180 degree. At some places rotation are clockwise for 90 degree means West become North, East become South. And at some places rotation are anticlockwise for 90 degree means North become West, East become North. At some places rotation 180 degree means East become West, North become South. Rotation are temporary and permanent.