The Point 1 will not affect the xi5, it has its own GPS system. The point 1 will be the GPS sytem for Lowrance units for location, waypoints, etc. The advantage to a point-1 vs the internal antennaes already in the Lowrance unit is speed and accuracy; and it will control any "spinning" as stated above. It also allows your boat position to be pinpointed while addressing a waypoint, because you can see the location of the bow in relation to the waypoint when you are sitting still.