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From my understanding it doesn't rely on the internet or Garmin servers. I believe it was called Iridium satellite network. It needs to work anywhere on the planet. It is a separate subscription based service.

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They do use Iridium, but its not clear who runs the end-service...if you use the SOS feature, it contacts a Garmin center (i believe), who then dispatch the appropriate services. Its not an actual sarsat plb.

So if Garmin's system is down, there is a very real risk that these services won't have anyone on the other end to answer the call.

It doesn't contact Garmin. It's a shared emergency response center akin to some home security system companies. They share with a few tracker services.

Update: The use GEOS https://www.google.com/search?client=firefox-b-1-d&q=garmin+...

Do you happen to know the name of the company? I didn't see one while i've been browsing for it, and it doesn't seem to be iridium themselves

edit: Thanks!

GEOS https://www.google.com/search?client=firefox-b-1-d&q=garmin+...

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