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So do PLbs rely on the sat network. Thei homing becon is very short range.

I would suggest you should have both. But Inreach allows you to say "Waiting on weather or rivers to drop" to those who...

What happens when you press the SOS button/

1/2 way down for inreach

you meaning the sos feature??

You have to open that SOS cover you can see to get at the "help" button below it then press it. Much like a PLB