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It is true that canopy will block tracking and OK messages. I'm not sure about HELP. I'll have to check the manual again, but I believe that HELP and 911 messages will be sent whether or not SPOT is able to get a GPS fix - unlike Track and OK.


With the GPS satellite system, you can receive your location data only. So the SPOT must use something else to transmit your position, and send a HELP call. If it uses the cellphone network, which uses microwaves, which are a higher powered signal, you will be ok if there is a cell tower you can reach. If no cell tower, you are SOL.

I'd be curious as to which networks the SPOT uses for which functions. Clearly it must use the received GPS signals to tell the device where you are, but how does it tell a central location where you are?