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11/3/22 

Pilot/Controller Glossary 

reported passing before proceeding on the same or 
diverging tracks. To establish/maintain longitudinal 
separation, a controller may determine a common 
point not originally in the aircraft’s flight plan and 
then clear the aircraft to fly over the point. 

(See SIGNIFICANT POINT.) 

COMMON PORTION

 

(See COMMON ROUTE.) 

COMMON ROUTE

 That segment of a North 

American Route between the inland navigation 
facility and the coastal fix. 

OR 

COMMON ROUTE

 

(See SEGMENTS OF A SID/STAR) 

COMMON TRAFFIC ADVISORY FREQUENCY 
(CTAF)

 A frequency designed for the purpose of 

carrying out airport advisory practices while 
operating to or from an airport without an operating 
control tower. The CTAF may be a UNICOM, 
Multicom, FSS, or tower frequency and is identified 
in appropriate aeronautical publications. 

(See DESIGNATED COMMON TRAFFIC 

ADVISORY FREQUENCY (CTAF) AREA.) 

(Refer to AC 90-66, Non

Towered Airport Flight 

Operations.) 

COMPASS LOCATOR

 A low power, low or 

medium frequency (L/MF) radio beacon installed at 
the site of the outer or middle marker of an instrument 
landing system (ILS). It can be used for navigation at 
distances of approximately 15 miles or as authorized 
in the approach procedure. 

a. 

Outer Compass Locator (LOM)

 A compass 

locator installed at the site of the outer marker of an 
instrument landing system. 

(See OUTER MARKER.) 

b. 

Middle Compass Locator (LMM)

 A compass 

locator installed at the site of the middle marker of an 
instrument landing system. 

(See MIDDLE MARKER.) 
(See ICAO term LOCATOR.) 

COMPASS ROSE

 A circle, graduated in degrees, 

printed on some charts or marked on the ground at an 
airport. It is used as a reference to either true or 
magnetic direction

C OM PLY WITH RE S TR IC TIONS

 An ATC 

instruction that requires an aircraft being vectored 

back onto an arrival or departure procedure to comply 
with all altitude and/or speed restrictions depicted on 
the procedure. This term may be used in lieu of 
repeating each remaining restriction that appears on 
the procedure. 

COMPOSITE FLIGHT PLAN

 A flight plan which 

specifies VFR operation for one portion of flight and 
IFR for another portion. It is used primarily in 
military operations. 

(Refer to AIM.) 

COMPULSORY REPORTING POINTS

 Reporting 

points which must be reported to ATC. They are 
designated on aeronautical charts by solid triangles or 
filed in a flight plan as fixes selected to define direct 
routes. These points are geographical locations 
which are defined by navigation aids/fixes. Pilots 
should discontinue position reporting over compul-
sory reporting points when informed by ATC that 
their aircraft is in “radar contact.” 

COMPUTER NAVIGATION FIX (CNF)

 A 

Computer Navigation Fix is a point defined by a 
latitude/longitude coordinate and is required to 
support Performance

Based Navigation (PBN) 

operations. A five

letter identifier denoting a CNF 

can be found next to an “x” on en route charts and on 
some approach charts. Eventually, all CNFs will be 
labeled and begin with the letters “CF” followed by 
three consonants (e.g., ‘CFWBG’). CNFs are not 
recognized by ATC, are not contained in ATC fix or 
automation databases, and are not used for ATC 
purposes. Pilots should not use CNFs for point

to

 

point navigation (e.g., proceed direct), filing a flight 
plan, or in aircraft/ATC communications. Use of 
CNFs has not been adopted or recognized by the 
International Civil Aviation Organization (ICAO). 

(REFER to AIM 1

1

17b5(i)(2), Global 

Positioning System (GPS). 

CONDITIONS NOT MONITORED

 When an 

airport operator cannot monitor the condition of the 
movement area or airfield surface area, this 
information is issued as a NOTAM. Usually 
necessitated due to staffing, operating hours or other 
mitigating factors associated with airport operations. 

CONFIDENCE MANEUVER

 A confidence man-

euver consists of one or more turns, a climb or 
descent, or other maneuver to determine if the pilot 
in command (PIC) is able to receive and comply with 
ATC instructions. 

PCG C