I fish Pickwick and have had 1197 for a couple of years. Have ordered an Onyx. The bottom is hard almost everywhere I fish and just bright return. Has anyone had and luck identifying mussel beds? Any suggestions for use on Tennessee River? I find it very difficult to see fish near bottom over the hard bottoms. Are there any sensitivity or contrast adjustments that help in these conditions. With all the big tournaments here, everyone knows all the best areas and I need to start finding some new schools.