[jimmythegreek]

Ken you can get interference from the TM just being in the boat with other electronics, all depends on your setup. If you have universal sonar in the TM you almost always get interference. I use the ferrite ring trick on all units I wire up regardless of the setup to avoid it, cheap insurance. Ive gone as far as to open up the TM and add a seperate ground wire to the hull if aluminum and that is a guaranteed fix but some ppl worry about warranty on new stuff. Hbirds are worst than lowrance, lowrance is pretty good with their shielding on the transducer wires. You can always turn up the noise filter and you will eliminate any interference, but I like many wanna see every blip and baitfish possible, I run my sonar raw with no filters, after a while you can tell what everything is just takes some time to play with it and learn it.