We have also developed an airlink modem which does link up via sattelite - this in turn downloads realtime data to a server here at our shop with a time stamp to read the data. Biggest problems with this setup is the cost of the modem, as well at current our database is set up to only monitor one system at a time - not sure how it would affect network speeds or if there would be problems reading 'packets' as the bus load increases with more than one unit being monitored simultaneously.