GEN 2  TABLES AND CODES

GEN 2.1  MEASURING SYSTEM, AIRCRAFT MARKING, HOLIDAYS

2.1.1  UNITS OF MEASUREMENT

The table of units of measurement shown in paragraph 3.2 is used for the dissemination of information and in messages transmitted to aircraft.

2.1.2  TEMPORAL REFERENCE SYSTEM

Co-ordinated Universal Time (UTC) is used in the air traffic and communication services and in documents published for international distribution by the Aeronautical Information Service. Reporting of time is expressed to the nearest minute, e.g. 12:40:35 is reported as 1241. Local time is 8 hours ahead of UTC. Time checks to aircraft are accurate to within 30 seconds.

2.1.3  HORIZONTAL REFERENCE SYSTEM

2.1.3.1  Name/designation of system

All published geographical coordinates in the Singapore FIR indicating latitude and longitude are expressed in terms of the World Geodetic System – 1984 (WGS-84) geodetic reference datum.

2.1.3.2  Parameters of the Projection

Projection is expressed in terms of Conical Conformal Projection.

Measurement ofUnits
Distance used in navigation, position report, etc.
- generally in excess of 4000m		* Kilometres (km) or Nautical miles (NM)
Relatively short distances such as those relating to aerodromes
(e.g. runway lengths)		Metres (m)
Altitudes, elevations and heightsMetres (m) or Feet (ft)
Horizontal speed including wind speedKnots (kt)
Vertical speedFeet per minute (ft/min)
Wind direction for landing and taking-offDegrees Magnetic (°M)
Wind direction except for landing and taking-offDegrees True (°T)
Visibility, including runway visual rangeMetres (m) or Kilometres (km)
Altimeter SettingHectopascals (hPa)
TemperatureDegrees Celsius (Centigrade) (°C)
WeightMetric tonnes (t) or kilogrammes (kg)
TimeHours and minutes, the day of 24 hours beginning at midnight UTC (hhmm)
* International nautical miles, for which conversion into metres is given by: 1 international NM = 1852 metres
2.1.3.3  Ellipsoid

Ellipsoid is expressed in terms of the World Geodetic System – 1984 (WGS-84) ellipsoid.

2.1.3.4  Datum

The World Geodetic System – 1984 (WGS-84) is used.

2.1.3.5  Area of application

The area of application for the published geographical coordinates coincides with the area of responsibility of the Aeronautical Information Service, i.e. the entire territory of Singapore as well as the airspace over the high seas encompassed by the Singapore Flight Information Region.

2.1.3.6  Use of an asterisk to identify published geographical coordinates

An asterisk (*) will be used to identify those published geographical coordinates which have been transformed into WGS-84 coordinates but whose accuracy of original field work does not meet the requirements in ICAO Annex 11, Chapter 2 and ICAO Annex 14, Volume I, Chapter 2. Specifications for determination and reporting of WGS-84 coordinates are given in ICAO Annex 11, Chapter 2 and ICAO Annex 14, Volume I, Chapter 2.

2.1.4  VERTICAL REFERENCE SYSTEM

2.1.4.1  Name/designation of system

The vertical reference system corresponds to mean sea level (MSL).

2.1.4.2  Geoid model

The geoid model used is the Earth Gravitational Model 1996 — (EGM-96).

2.1.5  AIRCRAFT NATIONALITY AND REGISTRATION MARKS

The nationality mark for aircraft registered in Singapore is the figure 9, followed by the letter V, i.e., 9V. The nationality mark is followed by a hyphen and a registration mark consisting of a three-letter group, e.g., 9V-BAA.

2.1.6  PUBLIC HOLIDAYS IN SINGAPORE

The following dates are notified as public holidays:

Name of HolidayDateDay
Christmas Day25 December 2025Thursday
New Year's Day01 January 2026Thursday
Chinese New Year17 February 2026Tuesday
18 February 2026Wednesday
Hari Raya Puasa21 March 2026Saturday
Good Friday03 April 2026Friday
Labour Day01 May 2026Friday
Hari Raya Haji27 May 2026Wednesday
Vesak Day31 May 2026Sunday
National Day09 August 2026Sunday
Deepavali08 November 2026Sunday
Christmas Day25 December 2026Friday