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They used GSM trackers this year, so yes. And then it's not real SOS, just sends a text to pre determined number.
@hippy they don't use spot tracker now.
I own a spot and inreach both with GEOS SOS. Essentially if I hit SOS the GEOS control room will move heaven and earth to come rescue me and won't stop still they get to me. I really would t race without it. A small cost for peace of mind.
Do the SOS functions rely on mobile signal? The ones I've used (running) all rely on the mobile network. On the Spine Race there is a known signal black spot and the rules ban stopping in this area for more than an hour for safety reasons.