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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