What is RVSM?
RVSM stands for Reduced Vertical Separation Minima. Airspace within the New Zealand domestic FIR and the Auckland Oceanic FIR is designated RVSM airspace from FL290 to FL410 inclusive. If you are planning to fly within these flight levels then the RVSM applies.
Cruising levels available if you are planning to fly south in the NZ FIR or west in the Oceanic FIR are FL300, FL320, FL340, FL360, FL380 and FL400.
Cruising levels available if you are planning to fly north inthe NZ FIR or east in the Oceanic FIR are FL290, FL310, FL330, FL350, FL370, FL390 and FL410.
Above FL410, RVSM does not apply and aircraft are required to have a minimum of 2000ft separation.
For more information on RVSM procedures - please visit the New Zealand AIP - ENR1.1, Page 23. ATS Airspace Classification may also prove to be an interesting read, available from the New Zealand AIP - ENR1.4.