The right button automatically turns you 90 degrees to the right and moves you to the next position in that direction. You will note that you will move into the thumbnail that this button points at. This button will be a blank icon when there is no possibility of moving to the right. Watching for when this button is available is an important indication of those spots where you can turn onto an intersecting road. On other occasions there will be a scenic view or close up available in this spot.
Scenic views are high resolution views of special interest.
Close up views are for reading historical markers.