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The Spot GPS / satellite tracker relies on the Globalstar constellation of satellites and is simplex - ie. ground to satellite communication only.
Whilst the delivery rate of GPS position, tracking and informational information is extremely good, one can never be sure the message got through.
To ensure a high delivery rate Spot sends GPS positions and messages multiple times. Along with position reports one can send "I'm OK" sched' reports as well as SOS duress, help and custom messages.
SPOT Gen 3
Spot Trace Theft-alert Tracking Device
SPOT X 2 Way Satellite Tracker and Messenger