Topper80:
Thanks, an other question:
RNAV (GPS) do not require a specific RNP (eg. 0.3). On my AOC I' m authorized to operate down to RNP 0.3 but we are not authorized for RNP approaches ( coded RNAV(RNP) ).
Where can I use my RNP 0.3 ??
I can only speak for the US. LNAV and LNAV/VNAV are RNP 0.3, but the lateral obstacle clearance areas are larger than RNP AR 0.30, and don't require the avionics redundancy required for RNP AR.
Then, we also have LPV and LP, which are predicated on SBAS augmentation. Western Europe is also doing SBAS augmentation.