RNP2 indicates the aircraft can navigate en route to an accuracy of +/- 2nm 95% of the time. Based on AC 91U you require CASA approval for that one.
S1 indicates the aircraft is capable of conducting an RNAV NPA.
Based on that if you have RNAV NPA on your CIR then file G R Z for equip, NAV/GPSRNAV PBN/S1 in field 18.