Units of measurement
The units of measurement used in all air and ground operations are in accordance with Annex 5 to the Convention on International Civil Aviation - Units of Measurement to be used in Air and Ground Operations.
The quantities in common use and their respective units of measurement are listed below.
|
Distance used in navigation, position reporting, etc. |
kilometre, nautical mile |
|
Relatively short distances such as those relating to aerodromes (e.g. runway length) |
metre |
|
Altitudes, elevations and heights |
metre, foot |
|
Horizontal speed |
kilometre per hour, knot |
|
Vertical speed |
metre per second, foot per minute |
|
Wind speed |
kilometre per hour, knot |
|
Wind direction for landing and take-off |
degree magnetic |
|
Wind direction except for landing and take-off |
degree true |
|
Visibility |
kilometre, metre if visibility is less than 5000 metres |
|
Runway Visual Range |
metre |
|
Altimeter setting |
hectopascal |
|
Temperature |
degree Celsius |
|
Mass |
kilogram, tonne |
|
Time |
second, minute, hour, day, week, month, year |