Optimistic Paranoid said:I think we've discussed these here before.
SPOT requires paying for an annual subscription. They are monitored by a private company. PLB's are more expensive, but require no subscription. They are monitored by the official government rescue co-ordination center, run by the US Air Force.
Here are a couple of good articles on them from Expedition Portal:
https://expeditionportal.com/personal-locator-beacons-and-satellite-messengers/
https://expeditionportal.com/what-happens-when-you-press-the-sos-button/
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