I have a second battery on the way for y Fuel EXe so I can do so some 50 mile loops and trails like the AZT. I ride solo 99% of the time. This has me thinking, what if things go wrong 25 miles from the nearest trail head. On my non-assist bike, I would never be that far from a trail head. This far from a trailhead you likely will not see other hikers or bikers. Anyone else think about this? What safety measures do you take? Has anyone ever used or tried the SOS feature on IPhone? It claims you do not need WiFi or cell phone coverage. I appreciate your thoughts.