Thanks DublinPilot - I guess that pretty much sums up what I was worried about so into the realms of a stand-alone GPS/modded-car-sat-nav...
I had a look on the infamous-ebay for the Garmin 60 as recommended above. It says that it is for hiking etc. but can have maps uploaded via sd card - would this make the unit usable with jeppeson or would it just be e.g. memorymap style CAA chart overlays?
Sorry for all the added-questions to the thread but guess I want to be sure of getting the right unit for what I want and don't know anyone with one to try/look at.