5. The system according to claim 4 , wherein the cluster spines appearing within the focused area of the one compass situated concentric to the other compass result in one set of spine labels and the cluster spines appearing within the focused area of the other compass result in another set of spine labels.
5. The system according to claim 4 , wherein the cluster spines appearing within the focused area of the one compass situated concentric to the other compass result in one set of spine labels and the cluster spines appearing within the focused area of the other compass result in another set of spine labels. 6. The system according to claim 5 , wherein the one set of spine labels is positioned along the outer circumference of one of the one compass and the other compass.