Airbus has a limitation regarding RNAV approaches. It says this:
An RNAV(RNP) approach may be performed, with GPS PRIMARY not available, only if the radio navaid coverage supports the RNP value and HIGH accuracy is displayed on the MCDU with the specified RNP, and an operational approval is obtained
This sounds like I could do an RNAV(GPS) approach using say LNAV minimums without GPS PRIMARY. Is that what other Airbus drivers or former Airbus drivers understand that limitation to mean?
If so, then what RNAV system are we then using? Is it a DME/DME RNP-.3 system? In the US at least almost all RNAV approaches prohibit using that for RNAV approaches. Any input is appreciated.