On Jan 13, 2009, at 11:01 PM, Gregory A. Carter wrote: > Our system forces users to verify their account first by sending an > APRS message from RF into APRS-IS with a key. How do you verify the message was sent on RF? You mention the APRS-IS, do you use the path on the packet appearing on the APRS-IS to verify RF origin? Steve K4HG