Hi there. Im new to more advanced gps units and am having some problems with my new (second hand) Zumo 660 regarding too maps. 1. When I try to download the Tracks4Australia for MAC Im redirected to a website Hightail but can't download it. Are there any other steps I need to take? 2. Is there a program that lets me convert my Ozieexplorer maps into Garmin friendly ones? 3. Is there any difference between Garmins too map set ($180) Vs the Oz too maps ($249) Thanks in advance.