Other than the silver tag that comes on the transducer cable, is their any other way to determine which transducer a person may have? I purchased a boat recently and it came with an HDS Live 7 on the bow that is networked with a HDS Live 9 at the console. Again, they are connected via Ethernet. I have a 3n1 and a skimmer HDI 83/200 455/800 on the transom. The problem I am having is with the HDS Live 7 on the front that is connected to a transducer on the trolling motor. The silver tag is missing from the transducer cable so I don't know exactly what it is. The transducer is connected to channel one and I have named it Ultrex and have selected HDI 83/200 455/800. When running the HDS 7 in sonar I can see all three transducers and everything works fine, but when I go to down scan my source options are only the skimmer on the transom or This Unit. When I select This Unit the transducer cannot find the bottom. Also in down scan I have no option for frequency selection. I have searched the internet and this board and cannot find a reason why. If there is anyone with some insight or suggestions I would greatly appreciate the input. Thanks.