PART 3 3. MNPS AND RVSM AIRSPACE OPERATIONS 3.1 Introduction 3.1.1 This Part of the Guidance Material outlines the main requirements and procedures including specialised procedures) necessary to operate specifically in MNPS and RVSM Airspace. However, it is stressed, that the information contained hereon RVSM applies equally to aircraft operating within RVSM Airspace elsewhere in the NAT Region but outside MNPS Airspace (i.e. within the WATRS area and the Bod Oceanic FIR, and which are also subject to the rules and procedures outlined in Part 2. 3.1.2 Good navigation practices are essential elements in the application of the MNPS and RVSM concepts. Fundamental differences exist between navigation systems, but the basic procedures for their application have much in common. This part of the Document summarises the key points for operating crews to note. Detailed information on good navigation practices in MNPS Airspace can be found in the “NAT MNPS Airspace Operations Manual”.