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Aviation
Aviation, aircraft and air-traffic acronyms explained.
MSA
Minimum Safe Altitude
MSAW
Minimum Safe Altitude Warning
MSL
Mean Sea Level
MTI
Moving Target Indicator
MTOS
Mountain Obscuration
MTR
Military Training Route
MVA
Minimum Vectoring Altitude
MWA
Mountain Wave Activity
MWO
Meteorological Watch Office
NAS
National Airspace System
NASA
National Aeronautics and Space Administration
NAVAID
Navigational Aid
NAVCEN
Coast Guard Navigation Center
NCWF
National Convective Weather Forecast
NDB
Nondirectional Radio Beacon
NEXRAD
Next Generation Weather Radar
NGA
National Geospatial-Intelligence Agency
NM
Nautical Mile
NMAC
Near Midair Collision
NOAA
National Oceanic and Atmospheric Administration
NOPAC
North Pacific
NoPT
No Procedure Turn Required
NPA
Nonprecision Approach
NRS
Navigation Reference System
NSA
National Security Area
NSW
No Significant Weather
NTSB
National Transportation Safety Board
NTZ
No Transgression Zone
NWS
National Weather Service
OAT
Outside Air Temperature
OBS
Omni-bearing Selector
ODP
Obstacle Departure Procedure
OIS
Operational Information System
OIS
Obstacle Identification Surface
OM
Outer Marker
OOP
Operations Over People
ORD
Chicago O'Hare International Airport
P/CG
Pilot/Controller Glossary
PA
Precision Approach
PAO
Public Aircraft Operation