MNPS is equivelant to RNP 12.6 but it is not RNP 12.6. IT is MNPS.
have a look at :
NORTH ATLANTIC MNPSA OPERATIONS MANUAL
Edition 2008
Chapter 8: MNPS Flight Operation & Navigation Procedures
It's all in there for free!!
Last edited by FE Hoppy; 17th November 2008 at 12:15.