Navionics Geonav S (Grey)data card

I have a ten year old GPS system which came on the 2nd hand boat I bought. It appears to work fine but will not zoom in beyond a global view of Donegal on the screen .It needs the local data card I think.The unit has a West Wales card in it (NE 055S S ) from year 2001. I think I need the NE 210S card to cover my area. Can it still be got? Has anyone got one? Or should I just cut my losses and go for new system?

You might find one on ebay.