Originally Posted by TomW
Perhaps the reason for the Ok Check transmissions at 10 minute intervals. And I understand that Globalstar is pushing data services (e.g., SPOT) over voice until their next generation of satellites is in place.
Spot uses the low speed data channels (AKA the Simplex channels) on the Globalstar satellites. It does not use the voice channel!
This simplex system has always been part of the Globalstar system, in all generations, present and future.