I uploaded the FEI-Zyfer WAAS papers to zippyshare if anyone is interested. http://www32.zippyshare.com/v/66696070/file.html Sam. Zyfer produced a paper on WAAS for timing. <http://support.fei-zyfer.com/downloads.aspx> You will need to create a log-in and password to download their stuff. Rob Kimberley