I bought a boat with an old finder/loran that doesn't work. I want to replace it with either a combo fishfinder/gps or a fish finder and a seperate gps. I have the room for 2 units and I was wondering what everybody elses experience has been? Any pros or cons from your experience? I was looking at the garmin 162 or 168 gps and gps/finder units and the freestanding garmin finders.