I've downloaded the View Ranger app and plan to trial it next time out. However, it looks like unless you pay for 'map overlays' all you get it a very basic version. The maps Richard uses on this website are better!
I also use the Australia Topo Maps app, which works great and a simple/mini version of my very expensive handheld GPS. You log your waypoints and tracks and can still download them onto your laptop and then AussieBushwalking. In fact I has dumped the handheld for the phone app!