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 New Year’s Day 1 January 2020 1 January 2021
Additional Special Holiday (added)12 February 2021
Makha Bucha Day Makha Bucha Day 8 February 2020 26 February 2021

Substitution for Makha Bucha Day

10 February 2020

Chakri Memorial Day Chakri Memorial Day 6 April 2021 6 April 2020
Songkran Festival Days Songkran Festival Days 13-15 April 2020 13 - 15 April 2021
Substitution for National Labour Day National Labour Day 3 1 May 2021 May 2020
Royal Coronation Ceremony Royal Coronation Ceremony 4 May 2021

4 May 2020

Visakha Bucha Day Visakha Bucha Day

26 May 2021 6 May 2020

H.M. Queen Suthida Bajrasudhabimalalakshana’s Birthday

H.M. Queen Suthida Bajrasudhabimalalakshana’s Birthday

3 June 2020 3 June 2021

Asarnha Bucha Day

5 July 2020

Buddhist Lent Day

6 July 2020

Substitution for Asarnha Bucha Day

Substitution for Asarnha Bucha Day

 26 July 2021

7 July 2020

H.M. King Maha Vajiralongkorn Phra Vajiraklaochaoyuhua’s Birthday H.M. King Maha Vajiralongkorn Phra Vajiraklaochaoyuhua’s Birthday 28 July 2021

28 July 2020

H.M. Queen Sirikit The Queen Mother’s Birthday and National Mother Day

H.M. Queen Sirikit The Queen Mother’s Birthday and National Mother Day

12 August 2020 12 August 2021

Additional Special Holiday (added)24 September 2021

H.M. King Bhumibol Adulyadej The Great Memorial Day H.M. King Bhumibol Adulyadej The Great Memorial Day

13 October 2020 13 October 2021
King Chulalongkorn Memorial Day Substitution for King Chulalongkorn Memorial Day 23 October 2020 22 October 2021
Substitution for H.M. King Bhumibol Adulyadej The Great's Birthday, National Day and National Father Day

H.M. King Bhumibol Adulyadej The Great's Birthday, National Day and National Father Day

 6 5 December December 2021 2020

Substitution for H.M. King Bhumibol Adulyadej The Great's Birthday, National Day and National Father Day

7 December 2020

Constitution Day Constitution Day 10 December 2020 10 December 2021
New Year’s Eve New Year’s Eve 31 December 2020 31 December 2021