GEN 2  TABLES AND CODES

GEN 2.1  MEASURING SYSTEM, AIRCRAFT MARKINGS, HOLIDAYS

1.  Units of measurement

1.1 Units of measurement to be used in flight operations and air-ground communications are as follows:

QUANTITY

UNIT OF MEASUREMENT

Distance used in navigation, position reporting, etc.-generally in excess of 2 to 3 nautical milesNAUTICAL MILES (NM)
Relatively short distances such as those relating to aerodrome (e.g. runway lengths) METRES (M)
Altitudes, elevations and heightsFEET (FT)
Horizontal speed, including wind speedKNOTS (KT)
Vertical speedFEET PER MINUTE (FT/MIN)
Wind direction for landing and take-offDEGREES MAGNETIC
Wind direction except for landing and take-off DEGREES TRUE
VisibilityKILOMETRES (KM)
Runway visual rangeMETRES (M)
Altimeter settingHECTOPASCALS (hPa)
TemperatureDEGREES CELSIUS (°C)
Mass (Weight)KILOGRAMES (KG) or METRIC TON (T)
TimeHOURS AND MINUTES, THE DAY OF 24 HOURS BEGINNING AT MIDNIGHT (UTC)

Visibility of less than 5 km may be given in metres.

2.  Time system

Co-ordinated Universal Time (UTC) is used in the air traffic and communication services and in documents published by the Aeronautical Information Services. When reporting time, the nearest full minute is used, e.g., 12 hr 40 min 40 sec is reported as 1241. Time checks to aircraft are accurate within 30 sec.

3.  Geodetic reference datum

3.1 All published geographical coordinates in the Bangkok FIR indicating latitude and longitude are expressed in terms of the World Geodetic System-1984 (WGS-84) geodetic reference datum.
3.2 The area of application for the published geographical coordinates coincides with the area of responsibility of the Aeronautical Information Services, i.e. the entire territory of Thailand as well as the airspace over the high seas encompassed by the Bangkok Flight Information Region in accordance with the Regional Air Navigation Agreement.
3.3 Aerodromes with coordinates which have been transformed into WGS-84 coordinates but whose accuracy does not meet the requirements in Appendix 1. Aeronautical Data Catalogue in Doc 10066 PANS-AIM, are listed below:

VTUN — Nakhon Ratchasima / Khorat

VTSN — Nakhon Si Thammarat / Cha - Ian

4.  Aircraft nationality and registration marks

The nationality mark for aircraft registered in Thailand consists of the letters HS. The nationality mark is followed by a Hyphen and a registration mark consisting of 3 letters, e.g., HS-TDD.

5.  Public holidays

NAME

Date
New Year’s Day1 January 2024
Makha Bucha Day24 February 2024
Substitution for Makha Bucha Day 26 February 2024
Chakri Memorial Day6 April 2024
Substitution for Chakri Memorial Day 8 April 2024
Songkran Festival Days13 - 15 April 2024
Substitution for Songkran Festival Days16 April 2024
National Labour Day1 May 2024
Royal Coronation Ceremony4 May 2024
Substitution for Royal Coronation Ceremony 6 May 2024
Visakha Bucha Day22 May 2024
H.M. Queen Suthida Bajrasudhabimalalakshana's Birthday 3 June 2024
Asarnha Bucha Day20 July 2024
Buddhist Lent Day21 July 2024
Substitution for Buddhist Lent Day 22 July 2024
H.M. King Maha Vajiralongkorn Phra Vajiraklaochaoyuhua’s Birthday28 July 2024
Substitution for H.M. King Maha Vajiralongkorn Phra Vajiraklaochaoyuhua’s Birthday29 July 2024
H.M. Queen Sirikit The Queen Mother’s Birthday and National Mother Day12 August 2024
H.M. King Bhumibol Adulyadej The Great Memorial Day13 October 2024
Substitution for H.M. King Bhumibol Adulyadej The Great Memorial Day14 October 2024
King Chulalongkorn Memorial Day23 October 2024
H.M. King Bhumibol Adulyadej The Great's Birthday, National Day and
National Father Day		5 December 2024
Constitution Day10 December 2024
New Year’s Eve31 December 2024