Mike - Get hold of a SBS. There are now a few hundred users now sharing their data on the net via a associated application call PlanePlotter. The data shared is realtime, not delayed, your setup will send a small packet of data every 60 seconds up to the Europe based server for users to access. The bandwidth used each month is relatively low, it wont upset any of your other online activities.
Have a look at this thread which discusses the system:
http://yssyforum.net/board/showthread.php?t=1203
There is continuous coverage for most of the major cities in Australia, and the airways in South Eastern Australia are fully covered.
Western Europe and Scandinavia have blanket coverage as does Florida, the Pacific North-West and parts of California.
Unlike AirNav there is no subscription fee for access or serving, and the "radar" is not delayed.
There is a bit more info here at my website:
http://www.satdirectory.com/--atcviasat.html
Cheers,
Mark F (Sharing data to the system from near YSRI 27x7 as user "By")