Looking to replace the original equipment Raymarine RC 435 chartplotter on our 2007 Hunter 31. The current unit is functioning with it old Gold card but I am moving the boat to Michigan and I am concerned that purchasing a new $200 chart card for the area may not work. Maybe it't time to upgrade the technology. I am looking for something that will plug and play with my current Raymarine Sea Talk cabling. Any advise is appreciated.