Looking on Google Maps at the location of the AirBnB I noticed that the same building also has a cafe/restaurant with a small shop selling groceries. However, reading the Google reviews of this shop/cafe, it says that they only take cash. I would have thought that the shop would be open at 8am on a Monday morning, but perhaps not. If it was, and JS had no cash, perhaps he would have looked at the map on his phone before the battery died and seen that the closest place for food/water/civilisation was the Mirador, which is uphill. It may not have looked too far away. I also note, from StreetView that there is an off road footpath heading towards a place called Sweet Home Masca, which may have looked like a shortcut to the Mirador. If you follow StreetView along this path it becomes very difficult to navigate/see where the path is and is absolutely full of cacti. It is easy to understand how you could very quickly become lost and disorientated in this place without GPS help.