Newbie here, any help is appreciated. Have purchased my first boat, a 2006 185 sport. The included depthfinder is gimpy and needs to either be repaired or replaced, but I really could use a combination navigation aid and depthfinder, something to plot and track my route and showing local charts as well as current depth. I know there are smartphone apps that can do the former, but an all in one unit would be helpful. What am I looking for, a chartplotter with gps? Not needing a fishfinder in particular although from what I've seen one of those might do the job. Any suggestions? (Sorry if this material has already been covered elsewhere, a point in that direction would also be helpful.)