I知 sure this is a dumb question but I知 getting conflicting opinions. I have a small jon boat with only a trolling motor. I bought a fish finder and I知 not sure about how to power it. I was told it could power it to the same battery I use for my trolling motor. I知 reading online this can cause interference. Any suggestions to save me some time and frustration would be appreciated. As you can tell, I知 pretty uninformed on fishing.