It was advised that I buy and install a chart plotter, I don't boat so I need some help, Bad! My son and neighbor fish lake St. clair, and just last night the Sheriff stoped them for a normal check. all was well everything was good to go and up to date. But after the check it was advised to install a chart plotter (to be safe). I looked at price's list night and the wife called 911- only kidding so my question is three part A. Can a guy buy a good used one, B. what is a good one C. How do I find a used one- not hot, fresh off the boat next door, if you know what I'm talking about. So far you guy's have been on the mark with everything,so any info you can give me is great Thanks