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 Day 1 January 2022 1 January 2023
Substitution for New Year's Day 3 January 2022 2 January 2023
Makha Bucha Day 16 February 2022 6 March 2023
Chakri Memorial Day 6 April 2022 6 April 2023
Songkran Festival Days 13 - 15 April 2023 13 - 15 April 2022
Substitution for Songkran Festival Days17 April 2023
National Labour Day 1 May 2023 1 May 2022
Substitution for National Labour Day2 May 2022
Royal Coronation Ceremony 4 May 2022 4 May 2023
Visakha Bucha Day15 May 2022
Substitution for Visakha Bucha Day16 May 2022
H.M. Queen Suthida Bajrasudhabimalalakshana’s Birthday H.M. Queen Suthida Bajrasudhabimalalakshana's Birthday and Visakha
Bucha Day
3 June 2023

3 June 2022

Asarnha Bucha Day

Substitution for H.M. Queen Suthida Bajrasudhabimalalakshana's Birthday and Visakha Bucha Day

5 June 2023 13 July 2022
Buddhist Lent Day14 July 2022
Additional Special Holiday (added)15 July 2022
H.M. King Maha Vajiralongkorn Phra Vajiraklaochaoyuhua’s Birthday 28 July 2023 28 July 2022
Additional Special Holiday (added)29 July 2022
Asarnha Bucha Day1 August 2023
Buddhist Lent Day2 August 2023
H.M. Queen Sirikit The Queen Mother’s Birthday and National Mother Day 12 August 2023 12 August 2022

Substitution for H.M. Queen Sirikit The Queen Mother's Birthday and National Mother Day

14 August 2023
H.M. King Bhumibol Adulyadej The Great Memorial Day 13 October 2023 13 October 2022
Additional Special Holiday (added)14 October 2022
King Chulalongkorn Memorial Day 23 October 2022 23 October 2023
Substitution for King Chulalongkorn Memorial Day24 October 2022
H.M. King Bhumibol Adulyadej The Great's Birthday, National Day and National Father Day 5 December 2023 5 December 2022
Constitution Day 10 December 2022 10 December 2023
Substitution for Constitution Day 11 December 2023 12 December 2022
Additional Special Holiday (added)30 December 2022
New Year’s Eve 31 December 2023 31 December 2022