Ozscott,
Are you saying you can connect your 178c direct to the pc with just a programmed data card?I,ve been informed by Garmin GME in Brisbane that I need to buy the mapping again but this time on a cd rom (for a retail price of $249)to be able to display the charts i have already purchased as a data card onto the pc.Think I may just invest the 250 into a dual battery system and the missus can go ahead and take the piss out of me when I grab a couple of beers and go sit in the boat and plot to my hearts content.
cheers