Old Style Navionics Chartplotter Card

[cgeist]

I am looking for an older style Navionics card for my B&G chartplotter that contains Lake Lanier, GA. The card is about the same size as a modern SD card but is twice as thick with two rows of contacts instead of one. I'm not quite sure what the card format is called, but I know the same cards work in a multitude of brands. A friend of mine has the same type of card in his lowrance fishfinder.