I do believe that the Older CMAP cards will still work in both the new and old systems. You will not get the advantage of the newer chips information in the older Furuno systems.
As to screens, I am taking a older one to ManMachine.com for a screen upgrade to let it be
as clear in sunlight as my Standard Horizon CP 170
jjmcdonald@hotmail.com jmcdnald@cisco.com