The Bay Area Ridge Trail is now available in the OuterSpatial app. This app, available for iPhone and Android (no iPad version yet) shows trails for all areas where a partner agency has provided the trail alignments, which includes the Bay Area Ridge Trail. An ‘interactive’ map has been available for several years through the ridge trail website, but it was not interactive in the sense of being location aware. The new app is, it has the ‘you are here’ blue dot so you can follow trails as you go. The Trails tab highlights the ridge trail in yellow, while the Outing tab shows trails that have been entered as part of an outing or trip. I used the app on my last ridge trail hike, Crockett Hills and Fernandez Ranch, and found it quite useful. Where there are unsigned or not clearly signed junctions, the app can keep you on track. Though a significant portion of the trails have updated signing, mostly correct, other parts have old signing, or confusing signing, or missing signing.
A screen capture of the app is below. It shows the two segments that I did on my most recent trip. You can zoom in for a great deal of detail, including other trails, creeks, and ridge lines. Check it out!