Ýou sent the messages via the iridium satellites which are NOT geosynchronous in their orbits (ie they move) so there can be a delay. Inreach keeps sending your message until it gets an acknowledgement that it have been recieved by the Sat/Service provider. Spot on the other hand tries sends it 3 times then gives up. The message is then passed from Land Earth Station into the terrestrial phone network and handled like a normal text. Some info is passed to Garmin as regards tracking the mobiles position etc but mostly its all automatic
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