I went on a very short known distance hike (a surveyed 4000’ cut where a trail was widened) this morning to check the fit and comfort of my Lowe Alpine Contour IV, and used AllTrails, Backcountry Navigator, and OnX Backcountry to track myself. AllTrails and OnX gave almost identical readings at 0.83 and 0.82 miles respectively, BCN said 1.31 miles outbound and 1.01 inbound. So I definitely need to work more with BCN to see where the inaccuracy came from. I really like its default map, and it also uses USGS topos so it’s like a twofer. I also downloaded Avenza but haven’t used it yet.