The RVSM cruising levels to be observed when required are as follows:
In areas where, on the basis of regional air navigation agreements and in accordance with conditions specified therein, a Vertical Separation Minimum (VSM) of 300m (1000ft) is applied between FL290 and FL410 inclusive, except when on the basis of regional air navigation agreements, a modified table of cruising levels based on a nominal vertical separation minimum of 300m (1000ft) is prescribed for use, under specified conditions, by aircraft operating above FL410 within designated portions of the airspace.
Cruising Levels Applicable in RVSM Airspace
Source: ICAO
See also:
Altitude Regulations
Altimeter Setting
Transition Altitude
Transition Level
System of Flight Levels
Cruising Levels
Semicircular Cruising Level System (ICAO)
Cruising Levels Applicable in RVSM Airspace