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MB—Magnetic bearing
MC—Magnetic course
MC&G—Mapping, charting, and geodetic
MCS—Master control station
MDA—Minimum descent altitude
MEA—Minimum en route altitude
MGRS—Military Grid Reference System
MH—Magnetic heading
mHz—Megacycles per second
MN—Magnetic north
MPP—Most probable position
MSL—Mean sea level
N—North
NATOPS—Naval Air Training and Operating Procedures Standardization
NAVAID—Navigation aids
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NCA—National Command Authorities
NCP—North celestial pole
NDB—Nondirectional radio beacon
NIMA—National Imagery and Mapping Agency
NM—Nautical mile
NOTAM—Notices to airmen
NRB—Nondirectional radio beacon
NUDET—Nuclear detonation
OAT—Outside air temperature
ONC—Operational Navigation Chart
PA—Pressure altitude
PCN—Planning change notice
PGF—Pressure gradient force
PI—Point of impact
PLOP—Pressure line of position
PPI—Planned position indicator
PRN—Pseudorandom noise
PW—Pulse wave
RADAR—Radio detection and reading
RB—Relative bearing
RF—Radio frequency
RLG—Ring laser gyro
RMI—Radio magnetic indicator
R/T—Receiver and transmitter
S—South
SAD—Sight angle drop
SAT—Static air temperature
SCP—South celestial pole
SD—Semidiameter
SHA—Sidereal hour angle
SID—Standard instrument departure
SIF—Selective identification feature
SKE—Station-keeping equipment
SSB—Single sideband
SIOP—Single Integrated Operations Plan
STAR—Standard terminal arrival route
STC—Sensitivity time constant
TA—True altitude
TACAN—Tactical air navigation
TAMPA—True altitude minus pressure altitude
TAS—True airspeed
TAT—True air temperature
TB—True bearing
TC—True course
TCN—Terminal change notice
TF—Time of fall
TFC—Time of fall constant
TH—True heading
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TI—Time remaining to impact
TLM—Topographic line map
TN—True north
TPC—Tactical Pilotage Chart
Tr—Track
TTG—Time to go
TWF—Total wind factor
UCN—Urgent change notice
UE—User equipment
UHF—Ultra high frequency
UPS—Universal Polar Stereographic
UTM—Universal Transverse Mercator
var—variation
VFR—Visual flight rules
VHF—Very high frequency (30,000-300,000 kHz)
VIP—Virtual impact point
VOR—VHF Omnidirectional Range
VORTAC—Combination of VOR and TACAN
W—West
WD—Wind direction
WF—Wind factor
WGS-84—World Geodetic System 84
WS—Windspeed
WTI—Wind to impact
W/V—Wind vector
Zn—True azimuth
ZN—Pressure pattern displacement
ZT—Zone time
Symbols
! - Aries (the constellation)
o – degree
' - minute
'' - second
θ - latitude
λ - longitude
Terms
Agonic Line—A line drawn on a map or chart joining points of zero magnetic declination for a
specified year date.
Air Almanac—A joint publication of the National Almanac Office of the United States Naval
Observatory and Her Majesty's Nautical Almanac Office. It provides coordinates of celestial bodies and
additional data required for celestial navigation.
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Air Distance (AD)—Distance that is measured relative to the mass of air through which an aircraft
passes; the no-wind distance flown in a given time (true airspeed X time).
Air Plot—A continuous plot used in air navigation of a graphic representation of true headings and air
distances flown.
Air Position—The calculated position of an aircraft assuming no wind effect at a given time.
Airspeed—The speed of an aircraft relative to its surrounding airmass. The unqualified term airspeed
can mean any one of the following:
Calibrated Airspeed (CAS)—Indicated airspeed corrected for instrument installation error.
Equivalent Airspeed (EAS)—Calibrated airspeed corrected for compressibility- of-air error.
Indicated Airspeed (IAS)—The airspeed shown by an airspeed indicator.
True Airspeed (TAS)—Equivalent airspeed corrected for error due to air density (altitude and
　
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