This refers to the standards required to operate in the North Atlantic (NAT) region.
A Letter of Authorization is currently required for NAT HLA / NAT operations, but it is issued primarily on the basis of an aircraft’s oceanic PBN capabilities (e.g., RNP-10/4/2) and long range communication equipment.
Note: Much of this airspace was previously designated as “NAT Minimum Navigation Performance Specifications (MNPS)” airspace. Operators without a NAT HLA authorization but with MNPS authorization may operate in the NAT HLA until December 31, 2019.
