Look on page #5 quick start guide. It does show a circle on the outer ring. Here is what I found. With the unit in North up it will show the circle you are talking about.If your unit is facing north the circle will be North .As you turn east, west etc. the small circle show the direction the top of the gps is pointing in. If you are facing west the 0 will be at the w side of the Satellite screen and so forth . Try it out.