Free GPS app for finding your way in Portugal, driving or walking

We have just returned from traveling in Portugal and want to tell other travelers about something that was very helpful to us there. It is a free app for driving in Portugal which can be used completely offline. We downloaded it from the App Store, chose English for our language, and it took us everywhere. It is called MEO Drive. It is easy to use, gives spoken turn by turn directions and can be programmed to avoid toll roads or motorways if you prefer to drive the small roads. You only need to enter the name of your next hotel and it will find a couple of routes to it.
We did not drive in Lisbon, but went by bus to Evora and picked up our rental car there. Then we drove to Marvão, Obidos, Bussaco, Pinhao and returned the car when we got to Porto. Driving in either Lisbon or Porto would be a nightmare, but we found it easy driving in the countryside using the app.
We paid a fee, (I think it was about 8€ ) to activate the transponder on the rental car so tolls could be calculated. When we returned the car we owed 7€ in tolls which we thought was very reasonable.
We talked to a couple who had paid 80€ to their rental car company for a car with GPS. It is not necessary to incur this expense if you have a mobile phone and use the free app.