M | Mach number (followed by figures) |
M | Metres (preceded by figures) |
MAA | Maximum authorized altitude |
MACC | Military area control centre |
MAG | Magnetic |
MAINT | Maintenance |
MAP | Aeronautical maps and charts |
MAPP | Military approach control unit |
MAPT | Missed approach point |
MAR | March |
MAX | Maximum |
MAY | May |
MCA | Minimum crossing altitude |
MCTR | Military control zone |
MDA | Minimum descent altitude |
MDF | Medium frequency direction − finding station |
MDH | Minimum descent height |
MEA | Minimum en−route altitude |
MEHT | Minimum eye height over threshold (for visual approach slope indicator system) |
MET | Meteorological or meteorology |
METAR | Aerodrome routine meteorological report (in meteorological code) |
METREPORT | Local routine meteorological report (in abbreviated plain language) |
MF | Medium frequency (300 to 3 000 kHz) |
MHDF | Medium and high frequency direction − finding stations (at the same location) |
MHVDF | Medium, high and very high frequency direction – fading stations (at the same location) |
MHZ | Megahertz |
MID | Mid−point (related to RVR) |
MID | Middle and Far−East |
MIFG | Shallow fog |
MIL | Military |
MIN | Minutes |
MKR | Marker radio beacon |
MLS | Microwave landing system |
MM | Middle marker |
MNM | Minimum |
MNPS | Minimum navigation performance specifications |
MNTN | Maintain |
MOA | Military operating area |
MOC | Minimum obstacle clearance (required) |
MOD | Moderate (used to indicate the intensity of weather phenomena, interference or static reports, e.g. MOD RA = moderate rain) |
MON | Monday |
MOPS | Minimum operational performance standards |
MOTNE | Meteorological Operational Telecommunications Network Europe |
MOV | Move or moving or movement |
MPS | Metres per second |
MRA | Minimum reception altitude |
MRG | Medium range |
MRP | ATS/MET reporting point |
MRVA | Minimum radar vectoring altitude |
MS | Minus |
MSA | Minimum sector altitude |
MSG | Message |
MSL | Mean sea level |
MTMA | Military terminal control area |
MTOM | Maximum take−off mass |
MTOW | Maximum take−off weight |
MTU | Metric units |
MTW | Mountain waves |
MTWR | Military aerodrome control tower |
MVDF | Medium and very high frequency direction – fading stations (at the same location) |
MWO | Meteorological watch office |
MX | Mixed type of ice formation (white and clear) |