c100, appreciate the clarification regarding the A320 RNP capability. That leads to the next question, what is the lowest current RNP-AR approval for Australian based A320 operators?
Back to the original point about an ILS vs RNP-AR solving the issue in the case of the Gold Coast, the RNP-AR is really only of benefit instead of an ILS if the operator is RNP 0.15 capable or below. From you comments about NZWN, you imply that operation is dependant upon more than just the lowest capability of the FMS, there are other issues to the lowest RNP value usable by each operator.