"Mapas de España" is free and you can get it from the Google Play Store, simply by typing in the browser "IGN" or "Mapas de España". (Make sure you don't confuse it with the basic orange version).
It is a very useful and very powerful tool that allows you to perfectly manage all the valuable information included in SITES OF SPAIN while visualizing a collection of maps of the Spanish territory with a very pleasant and intuitive design.
Map viewer "Mapas de España" (and "OruxMaps" also) allow to obtain the navigation instructions to the waypoint selected by the user directly on the map for the GPS navigator of his choice (Google Maps, Sygic, Waze, etc.).
Also allow to use the offline GPS navigation assistants "GraphHopper" (recommended)* or "Broute", integrated in the map viewer itself, to generate and visualize in it the recommended offroad route to reach the chosen point from our current GPS position, with visual and voice navigation instructions, which even show by colors the slopes of the terrain to be traveled.
*Requires file downloading and installing (file "europe_spain.ghz" for the browser "GraphHopper"), free and easy to obtain. The viewer "Mapas de España" itself tells you how to download it the first time you want to use the "GraphHopper" navigation assitant. Once the file is automatically downloaded and unzipped, simply go to the map viewer menu at "Settings/Tracks/Routes/GraphHopper Offline/Graphhopper Offline Address" and select the "europe_spain-gh" file (in the directory: "storage/emulated/0/oruxmaps/graphhopper/europe_spain-gh.