I think I put up some bad info in the first post. He sent his SOS at 7 PM. His friend wrote:
"He couldnt find his way dilerious, tired, and too dark to see and I imagine to icy to tell. I had a sgt leading him to the trail by his locations on his GPS but he shut it all down at 2am on us"
I think he found the trail and then had to stop and quit moving due to exhaustion and cold. He started moving again at first light.
So his unit was on for hours after the SOS, and the "sgt" was able to text him and tell him what direction to go to get back on the trail.
