Once you found a route in the internet (GPX format), you can download this route to your smartphone.
MAPPO shows the route and sourounding map area.
With two clicks you can download the route and all map details to your smartphone and save them locally without any further costs.
On the trek you can later on open the map without any internet connection and navigate on the map.
By using your smartphone's GPS signal you will never get lost.
The "MAPPO Free" edition is free of chage.
The only limitation to the "MAPPO Pro" editions is the fact, that you can only save up to three maps.