We have just been mountain biking in Andalucia for 4 weeks, particulary enjoying the GR247 in the
Orux v6.5.7 worked perfectly with IGN mbtiles mapping on my Fairphone2, with no problems at all. It was very useful for getting an overview of the next stage, detailed navigation, and planning route changes when necessary. I like the ability to zoom with changing map scale by piching in/out - or at fixed map scale with the volume control, which it good for getting an overview.
Thanks for all your hard work! Donation coming next!