I haven't been on this board fro a while, bushbear forwarded this to me. First off I appologize for the problems you are having tmr360. There are a couple of things that can cause the problems you are having. The first thing to address is the software, go to the Lowrance web sight, hit downloads then go to software updates, check for all of the units you have and make sure you are current, if your units aren't current you can download the software updates to an SD or MMC card, the instructions are there on how to do this, then install them in each unit. The second thing you want to check, and from the nature of your complaint I think is the real problem, your power cord has two cables on it, one is power and the other is a "communications" cable, check all of the wires and crimp butt connectors on the ends that aren't being used, if any of the wires are bare and come in contact with each other it will cause most of the problems you describe and I think this is most likely what is happening, especially when you say they went away when you took the HDS10 out of the loop. The clicking on your VHF can be two things, the first was a software problem and current software will solve it, the second could be from the transducer on one or both of your units and can happen when power comes from the same busbar or when wires for your VHF and Sounder are run next to each other, your can try putting the radio on a different busbar or fuse panel, move the wires so they aren't running parralel to each other or install a RF filter for the VHF. The slow redraw can be a couple of things, first again is the software and there was a software update that specifically addressed this problem, the second can just be that everything is running at the same time, kind of like running several different programs on your computer will slow it down the same thing can happen with your unit, especially if you are using a Navionics "Fish'n Chip". I hope this helps and again I appologize for the problems you have had. If you want to get the most out of the sounder side of your units turn your "ping speed" up, at 15 the broadband sounder kicks in and at 18 the picture definition gets better, if you are running two or more units with transducers for each make sure the ping speeds are different this will stop the interference between the two.