I also own a 2005 Hunter 36. When I purchased the boat 8 years ago it had the original C80 mfd. I had to update my C80 mfd to download the navionics for Georgian bay. I purchased the new card and cable to connect the card to my desktop the download was successful. This past year I upgraded the Raymarine C80 chart plotter, the autopilot with the new Raymarine equipment. All of the original equipment is in my basement collecting dust if you would be interested in it.