Another Update:

I've had no luck trying to dump regions from a SPc320 which has regionalized memory similar to the older StreetPilots and no visible file system as in later SPc5x0 and nuvi units. Neither of the above methods work and nor does using Dump 0x04. Anyone have any suggestions? I'm getting a bit lonely here talking to myself, maybe i should have just left the above posts back in [Only registered and activated users can see links. ] as some interest was shown there ...
C'mon you old guys, you can't have forgotten this stuff surely?