You normally either buy a mapping GPS preloaded with topo maps or not, if not it will just come with the base map which will only show main arterial roads.
You need this to be able to use the unit to its potential-
Latest version 6 (Mid 2018) Covers Australia and New Zealand with updated HERE Maps data. Fully scalable 100k mapping with coast-to-coast 3D DEM (digital elevation model) accompanied by 10m contours and NAVTEQ routable roads for navigation on compatible units. Search for points of interest by...
I also use Avenza on android as well but if I am on foot I will have both.