Hiked the first of 4 segments planned with Nell to hike the entire Backbone Trail in the Santa Monica Mountains. This gps track was recorded using the All Trails app on my phone, and then I transferred the track to RWGPS. My phone died and I lost a short part of the hike as we neared Saddle Peak Rd, about 0.7 miles form the finish, but I plugged the phone into an external battery I was carrying and resumed recording soon after the snafu. Some parts of the trail, particularly at the top of the bump between Topanga and Old Topanga were poorly marked, and I will need to download Nell's track to have better resolution of our missteps in finding our way along (as All Trails does not record as many data points). RWGPS has their algorithms tuned for cycling, so it has moved a lot more of our time on the trail to stopped time. All Trails set the stopped time at 1 hr 15 min out of a total time of 9 hrs 18 min.