I have a new-to-me Beneteau 361 (2000 model year), and it came with an old Raymarine RC320 in the steering pedestal. It is flaky and doesn't show depth when it does work. Is there a new model I can just plug into the same space occupied by the RC320? I don't know much about these electronics, it's my first boat with this type of equipment. Ideally I could get a multi-function unit that has a fish finder as well as a chartplotter.