I have a 997 and 998 both have their own transducers an GPS antennas. I want to link them to share waypoints. What do I need? Also want to keep both transducers as one is on the bow the other on trolling motor. I think I'm going to have to get rid of one antenna. 1 more thing both units have waypoints on them how do I keep all these waypoints? Thanks for any help

