Nik, This is not a bad link to learn a bit more: http://wa8lmf.net/DigiPaths/ and here is another one: http://www.aprs.org/aprs11.html Cheers, Gerard VK2JNG -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.aprs.net.au/pipermail/ozaprs/attachments/20110202/905433fc/attachment-0001.htm>