I think that the time stamp is actually the GPS time derived from the SPOT device. I've just had a quick look on the SPOT website and the update rates are set at about 5 minute intervals of the 911 type message and 10 minutes for the Tracking messages, so to send a message as described would have a baud rate about 0.0033 Baud (bits per sec) or to put it another way compossing a message length of 120 letters (average 4 bits/character) would take around 40 hrs to send. Perhaps someone should tell the NSA.

http://www.amfearliathmor.pwp.blueyonder.co.uk/morse_message.mp3