NAD83 Abbreviation for: North American Datum 1983 Fr: NAD83
NAR Abbreviation for: North American Route
. see: North American Routes System (NAR System)
Fr: NAR
NAR System Abbreviation for: North American Routes System Fr: réseau NAR
NAS U.S.: Abbreviation for: National Airspace System
NAT Abbreviation for: North Atlantic Fr: NAT
NAT OTS Abbreviation for: North Atlantic organized track system Fr: NAT OTS
National Airspace System U.S.: The common network of U.S. airspace; air navigation facilities, equipment and services, airports or landing areas; aeronautical charts, information and services; rules, regulations and procedures, technical information, and manpower and material. Included are system components shared jointly with the military.
. abbreviation: NAS
NAT Region
The region encompassing the northern portion of the Atlantic Ocean, as defined by ICAO.
Fr: Région NAT
NAVAID Abbreviation for: navigation aid Fr: NAVAID
NAV CANADA The corporation providing air navigation services in Canadian airspace and ATS in international airspace for which Canada has assumed responsibility. Fr: NAV CANADA
navigation aid Any visual or electronic device, airborne or on the surface of the earth, that provides point-to-point guidance information or position data to aircraft in flight.
.
abbreviation: NAVAID

.
also called: navigational aid

Fr: aide à la navigation
navigational aid Other expression for: navigation aid (NAVAID)
navigation change-over point Other expression for: change-over point
NCA Abbreviation for: Northern Control Area Fr: NCA
NDA Abbreviation for: Northern Domestic Airspace Fr: NDA
NDB Abbreviation for: non-directional beacon Fr: NDB
“Negative”
An expression used in radiocommunication meaning “No,” “Permission not granted,” or “That is not correct.”
Fr: . Négatif .
night The period of time during any day that starts at the end of evening civil twilight and ends at the start of morning civil twilight. Fr: nuit
no-compass approach A radar approach or vector provided to a pilot when the compass or directional indicator is malfunctioning. Instead of providing the pilot with headings to be flown, the controller observes the radar track and issues the control instructions “Turn right,” “Turn left,” or “Stop turn,” as appropriate. Note: Emergency no-compass homing service can be provided using a direction finder (DF). Fr: approche radar sans compas
no gyro approach U.S.: Expression for: no-compass approach
noise abatement procedure  A procedure developed to ensure that the necessary safety of flight operations is maintained while exposure to noise on the ground is minimized.  Fr: procédure d’atténuation du bruit