On 14/12/2009, at 10:24 PM, Scott Penrose wrote:

> The system used for the emergency does not rely on the SMS service we are 
> talking about here

Sorry, I meant to explain the above...

SPOT receives potion by listening to the GPS.

It then sends a message using data portion of Satellite Phone network (similar 
to SMS), which is picked up by the central monitoring service in the US. This 
message has nothing to do with normal phone networks.

Then the central server forwards that message to internet servers. These 
internet servers, which are not used for emergencies, then do the non emergency 
stuff such as OK, Help and Tracking - and of course the Public and Private URLs 
for viewing your tracks/messages.

Scott


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