Yes, that's correct. CASA hung it's hat on an ICAO SARP we were told. Nav wasn't an issue but we did need to keep an eye on the fuel temp. The fuel temp prediction sheet was a dog's breakfast but watching the EICAS worked. The loneliest position I ever saw on that route was when our nearest diversion ports, Christchurch and Punta Arenas, were both 3hr55 away. OTOH the ice was spectacular.