In NZ it is 2 x the primary nav protection area + 1NM. The primary protection are for RNP(AR) is 2 x RNP. ICAO requirements are that RNP0.3 minima are always published, even if lower RNP values are also used. So, for an RNP0.3 approach it would be 1.6NM ...
The RNP(AR) missed approach segment (using the ICAO criteria) is problematic, and needs refining - I'm afraid you will just have to put up with it for now! Under certain circumstances it can be operationally beneficial to use RNAV(GNSS) missed approach criteria (and is permissible).
Last edited by reynoldsno1; 21st May 2012 at 23:28.