OZ,
Looks like this time around, somebody has figured out that SBAS (aka WAAS) will be (maybe) cheaper than the existing differential GPS in providing precision positioning systems.
A considerable saving to AMSA, but who pays??
The obvious benefit to aviation will be a welcome but very much second order outcome.
Tootle pip!!
Cessnapete,
Nothing in Australian aviation regulation is clear, concise, and straightforward.