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I also use this app and is great at places like glasshouse when it records where you have been and you can see on the satellite images where your going, it will work out in remote areas but the map...

Apparently the app is free now.

I was lucky enough to get a copy of maps ( Hema, ubd and many mining lease maps) off my wife's uncle but you can buy the app for like 7$ and it comes with 3 aus wide maps ,
then upload maps you have...

I'm using memory map and still learning the in's and outs but its been great so far