Yes and no. They are range rings. So if you have the rang link turned off you can zoom in and out on your chart without changing the range on the radar and vice versa. So lets say your radar is set to a 1 miles view and your chart is zoomed out to 2 or more miles, you will see 4 rings representing the 1/4 mile increments. Now if you zoomed into 1/2 mile on your chart you will only see 2 of the 4 rings. Since the 3/4 and 1 mile rings are outside of your field of view.So the green range ring shows how far the radar will cover on the present chart that is displayed?