Depends what you want.. the gold standard is a NOAA PLB (I carry the ACR ResQlink) - but these are really for "I am going to die" situations.
I am personally not a fan of the Spot or the "hobby" trackers if there's a risk of death involved. Plus the PLBs last 6+ years with no recharging/service, so you know it is gonna be there when you really really need it.
The ideal combination would probably be carrying a PLB + InReach sat phone for non-life threatening scenarios.
Personally I just carry the PLB, and let my wife know to send help if I'm wildly off schedule.
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