Thrive on track.
All the normal features you would expect like offline topographic maps, terrain profiles, photos and tracknotes to help you navigate on track, but also lots of information to help you prepare.
Use the packing and planning checklists to make sure you are well prepared. Information on country, flora, fauna and geology. Learn helpful bushcraft skills, information on good gear selection, menu and food planning and refresh your first aid knowledge. If you are not wanting the app but want some of the information online for free, checkout out the Overland Track on Bushwalk.