Check out this site.
http://www.c-map.com/chartcatalogue/2C1DA057
I know Furuno uses Cmap.
I could not find it but they have a customer support number in Cape Cod. Call them (ask for Brandy) and she will get you going. If you cannot find the number email me and I have it someplace or othere.
Ooppps..........might be uelsess help I just offered. I know Furuno now uses Cmap but not sure if they alwasy did or not.