NAT

NAT
North Atlantic Tracks.
NATIONAL AIRSPACE SYSTEM (NAS)
The common network of US airspace; air navigation facilities, equipment and services, airports or landing areas; aeronautical charts, information and ...

ORGANIZED TRACK SYSTEM- A series of ATS routes which are fixed and charted; i.e., CEP, NOPAC, or flexible and described by NOTAM; i.e., NAT TRACK MESSAGE.

and appear on navigational charts (e.g., the NOPAC tracks over the Northern Pacific Ocean). Others change on a daily basis depending on weather and other factors and therefore cannot appear on printed charts (e.g., the North Atlantic Tracks (NAT) ...

See also: Pilot, Airport, Landing, Service, Air traffic