Back on topic,i run a garmin 60 csx with bluchart,shonky, ozemap ,vic & some of NSW topo as well as a street map could be IGO all on 1 sd,.,use the Tomtom for street use.Bought another Tom tom in USA a few weeks ago [5 inch]was invaluable in navigating around US & Canada,had live traffic upate which worked great.Hugh