There are lots of negative comments about HEMA maps using their hardware but HEMA maps for your phone is very good for showing you where you are, what is around you including rest stops, side roads etc in the outback. In my opinion it is the best out there.
It’s basically a raster map. Ie it’s the equivalent of the paper map but shows your position in relation on the map. It won’t tell you which way to go but in the outback if you are relying on a digital map to tell you where to go and do t know where you are without,, then basically you are an idiot and will be a statistic in short order. You need to be aware of where you, use your trip metre to know how far along a road you have travelled and whether that is reasonable compared to your paper map expectation.
I have travelled widely in Australia over many many years. . HEMA paper map book (for context) and Hema digital for iPhone is great. I bought the HEMA app 10 years plus ago and I still get the updates and it works great.
By all means get other apps too but every time I travel with other people with other apps, it’s always me telling people when roads or stops are coming up. HEMA iPhone maps always wins.
I have traveled very remote locations and trust the app and the paper maps together.
Enjoy your travels.