The smartphone is definitely better than equipment that an average person has no idea how to use, yes. On the other hand, you need pre-downloaded maps that sho

The smartphone is definitely better than equipment that an average person has no idea how to use, yes. On the other hand, you need pre-downloaded maps that show trails and landmarks, as well as a general sense of the terrain and some basic preparedness. The fact that they didn't even realize they were on the wrong trail shows an absolute failure to plan ahead and navigate correctly. That is really the larger problem - a 17 mile hike is not a light stroll through the woods. If I were doing such a trail (and I'm hardly a seasoned outdoors enthusiast) I would have pre and post hike arranged check-ins with emergency contacts, backup batteries, suitable clothes, 2 light meals worth of food and water, and a rough mental map of the area. None of these things are hard to do or require spending tons of money at sporting goods stores, they are just common sense.