I get my maps from Stanfords of London and my general direction from a compass or the sun / stars when visible.
And, yes, I have used various map.apps and gps tracks and I've found most of them disappointing (to put it politely). Having once, and only once, followed a GPS track put up by someone who could obviously neither read a map or a landscape I prefer to trust my own judgement, or just follow the yellow arrows.
My Ultra-marathon running, IT savvy, son tells me that Maps.me is 'cool'. What would I know?