I have the Furuno 1833C installed on my boat, but I am having a hard time finding the cartography for it. This is the NavNet 1, not the VX2. Everyone wants to sell me Mini-SD cards. My machine uses the big cards with the slot down the middle. Where do I find those? I have a Navionics N/E Florida card that came with the machine. Can I have that formatted and the VA coast and Lower Chesapeake put on it? If so, who does that? Thanks.