Navman N Series Pan Euro Maps

I bought the Navman N20 map update for my Navman with the intention of making my sat nav unit fully Europe-friendly. Getting a Navman European Map made sense so that I've got maps for wherever I could possibly drive.Although having played about with the sat nav (and I've found the Navman POI update to be fairly accurate), the major gripe was that I had to invest in a 2GB SD memory card because the internal memory on my Navman N20 isn't anywhere big enough to store a full Europe map.