Keep the map with no signal
Your phone loses signal an hour past the last town, just when you need the map. Download Australia before you leave. Then the map, route planning and the voice that calls your turns all work with no signal.
1Open Menu, then Offline
Tap Menu at the top left of the screen. Then tap Offline at the top of the menu. This tab holds everything you can keep on your phone. The downloads are big. Do this at home on wifi before you leave. Keep your phone on its charger if you can.

2Download Australia
The first card says Download Australia. It is one download for the whole country. It holds the map, the hills and offline routes. It is about 2.8 GB. Tap Download. Keep the app open until it says Downloaded. If it stops, tap Get the rest to carry on. You won't lose what is already done.

3Add satellite if you want it
Once the map is on your phone, a Satellite (optional) line shows on the same card. It has its own Download button and size. You don't need it for the map or routes. It is big, about 2.7 GB. It only shows when you have no signal. To take it off, tap Remove.

4Leave Map source on Auto
At the top of the Offline tab, tap Advanced. Map source is inside. Leave it on Auto. Auto uses the online map when it can. When nothing comes through, it moves to your downloaded map by itself. Then it moves back. Offline only always uses your download. Online only never does. The line under Advanced says which map it is using now.

5Head out and tap Nav
With no signal, the map, place names and 3D hills still show. A route you planned stays on the map. Tap Nav, and it still says each turn out loud with your phone's own voice. With the Australia pack, you can plan a new route with no signal too. Live things like rain radar, new weather and fire updates need a signal.

Good to know
Your maps are kept in your phone's web browser. If you clear your browsing data, they go too. On a phone, the app may offer to download the maps and route data for you. Tap Download on that card, or Not now. Stop ends a download part way. Had state maps from before? The tab lists them as Older downloads on this phone, with a Remove button.
Also in the app: turn by turn navigation, campgrounds and free camps, and Plan with AI. It plans routes for nine kinds of vehicle, from an enduro bike to a 10-metre motorhome.