Units of measurement
2.1.1 Units of measurement
The following table of units of measurement wiil be used by aeronautical stations within Sofia FIR for air and ground operations.
|
For measurement of |
Units used |
|
Distances used in navigation, position reporting etc. |
Kilometres, Nautical Miles and tenths* |
|
Relatively short distances such as those relating to aerodromes (e.g. RWY land) |
Metres |
|
Altitudes, elevations and heights |
Metres, Feet* |
|
Horizontal speed |
Kilometres per hour, Knots* |
|
Vertical speed |
Metres per second, Feet per minute* |
|
Wind speed |
Metres per second, Knots* |
|
Wind direction for landing and take-off |
Degree Magnetic |
|
Wind direction except for landing and take-off |
Degree True |
|
Visibility including RVR |
Kilometres or metres |
|
Altimeter setting |
Hectopascals |
|
Temperature |
Degrees Celsius (Centigrade) |
|
Mass |
Kilogrammes, Tonnes* |
|
Time |
Hours and minutes, beginning at midnight UTC |
Note: Units of measurement annotated by * are used as alternative in accordance with Regulation № 5 of the Ministry of Transport and Communications and ICAO Annex 5.