From what I can gather, I think the hike they were on is well known, but can be hard to navigate and requires are certain amount of route finding ability.

This has brought up something I've been wondering about. Which is the more critical piece of kit: the GPS or the PLB?

I am thinking about my situation particularly, I'd have the appropriate map & compass and some basic skills, but not a whole lot of experience with them. Granted, in the near term I'd be sticking to fairly well known areas, but arguably these women were as well.

So, given that, what would be the priority in acquiring new gear? The GPS which should help us stay found or the PLB which would allow us to eliminate the search part if we do become lost and are overdue.

Thoughts?