Hello,
I had one small PLB but was thinking to buy one more (we are crew/family of 5). But discovered this equipment:
https://buy.garmin.com/en-US/US/p/561286
It looks like you can send distress signal (to GEOS).
And they will know your position.
You can even send Text message ... It is Satellite tool.
Yes it require monthly payment but you can pay for these months when you on the water (like me only 2-3 vacation months)
Can't find info if it is floating and/or waterproof which is most important for boating I suppose
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Strange - there is review for boaters but nothing about waterproof or not
https://www.boatingmag.com/garmin-inreach-explorer%2B