Im curious if this can be done........I have 2 boats now and will be switching my 998 back and forth and getting another one or an 1100 series in the next week or so. On my older boat I have a 596HD mounted on the bow thru the US2 and the 998 next to it w the HDSI on the transom, and I like it cause I can use the whole screen for staying on waypoints/navigating and the 596 full screen for sonar, but sucks that the HDSI is on the transom instead of up front. What I wanna kno is can I run a reg 500 series thru the US2 on my terrova and get a HDSI SI ducer on the trolling motor and set the 998 to just do The DI and SI without sending 83/200 sonar into the water so I have the 2 units not interfering with eachother? I know u can set what ducer u use in the options but not sure if you can turn off 2d sonar only and use the rest...........TIA