When moving in nature printed maps are the must. However, when I plan routes, I use different online maps.
In a mobile phone I use app “Maastokartat” that provide free online maps. One can also purchase ability to download maps for offline use.
These maps are based on National Land Survey of Finland maps.
Sometimes if I am not quite sure about my location, I check it using my mobile and for that I have downloaded maps on the region where I am.