Thanks I've been looking for an off-road app for Android which can use my topo maps I use with oziexplorer, I'll have a play with the trial version (although the UI gets a bit of a slagging in Android Market). I had a look at Backcountry, but maps import seems to be limited to those from goverment site Geoscience Australia, Creative Commons licensed, 1:250,000,
http://www.ga.gov.au/mapconnect/. Those maps just don't have sufficient detail.
I want to be able to use maps I've already purchased (1:25,000) and import of GPX files for routes, tracks, waypoints, as well as saving the tracking I drive when exploring.
-R