With only the ethernet cable between the units, it will automatically share waypoints and you can select to view either sonar. It is a little complicated but you can set the bow sonar to display what the console (rear transducer) is showing, and vice versa. What is complicated (for me) is figuring out which one needs to change back, so I never use that feature.Each unit will save a waypoint created from the other unit, and each will delete one deleted from the other. If one sonar is off and a waypoint is saved or deleted from the other unit, it will update when the unit is turned on. Pretty neat, all with only the ethernet cable.