A Compass tab
in the left of the Map Builder enables
you to show a compass. This is useful when your map is displayed using
a coordinate system that makes it difficult to recognize the direction.
If you change the projection of your map to, for example,
Albers Equal Area and then zoom in a number of times, you may lose
your sense of direction. However, if you click the Compass tab you will see that it always
indicates north as seen from the center of the view.
The following figure shows the Compass tab
with the compass indicating north.