For flights in defined portions of airspace where, based on Regional Air Navigation Agreement, minimum navigation performance specifications (MNPS) are prescribed, an airplane shall be provided with navigation equipment which:1. Continuously provides indications to the flight crew of adherence to or departure from track to the required degree of accuracy at any point along that track;2. Has been authorized by CAA for the MNPS operations concerned; and3.When operating under minimum navigation performance specification (MNPS) in north Atlantic, the requirements in Attachment 16 shall be met.ATTACHMENT 16 Operations in North Atlantic (NAT) Minimum Navigation Performance Specifications Airspace.pdf