Thank you all for you input. This is much more involved than I thought and I will definitely look into your replies in more detail, including suggestions for further reading. Just a note that I only use my phone on the trail to take pictures and look at any downloaded maps. No earphones, no distractions. I truly want to connect with my surroundings and as a female, I'm always paying attention to what's around me. That said, I still tend to end up off trail somehow. Sometimes it's a bad app/map thing, sometimes it's just a mystery (like last year when the blazes just ended and we became VERY lost, unable to find our way back, ended up finding a nice couple who were also lost and made our way back together...long story). I appreciate all of these responses and please feel free to keep 'em coming! Thanks!