Big Kev, its a good question, and I should know the answer - but I don't. The answer should lie in the manual - which must be carried in the aeroplane.
What is the issue?
TSO C146a ..... are expected to be approved for sole means of navigation for enroute navigation
As far as I can see this is the only issue that is relevant to TSO129/146 debate at the moment.
It doesn't seem to be a big deal when flying in SSR covered airspace - as I am often offered long GPS based routes by ATC eg yesterday I was offered (and accepted) "
Gladstone direct Townsville", rather than the flight-planned GLA-RK-PROBO-MK-CLIFT-ALISN-YBTL.
It may be a bigger issue outside of radar coverage - or for aircraft engaged in charter and RPT, but didn't stop me from flying Tennant Creek - direct Broome last year.
CASA staff have confirmed that the US WAAS correction signal does cover Australia
Don't know if this is so
Jaba! The Garmin 496 is WAAS capable - but does not pick up any signal when flying around Qld!
Dr 