Both units have same same software, One unit full screen chartplotter and the other full screen sonar. Everything is in the network also. I would place a new point on the sonar screen and it would not show up on the plotter screen. I cannot seem to figure out why. I changed to split screen the chartplotter to include sonar and then it worked fine. I did not have time to really look into what was going on. I figured I would ask in case I had a simple setting wrong. I will get to the boat and try it again.