DIGEST Datum Codes

Horizontal Datum from DIGEST DIGEST Code Ellipsoid
Notes: (1) Horizontal datums can be used as vertical datums when the measure is made relative to the ellipsoid. (2) The original DIGEST table did not identify an Ellipsoid for every datum, and all misspellings are copied from the original DIGEST table as is.
Adindan ADI US - Clarke 1880
Adindan (Ethiopia) ADIA US - Clarke 1880
Adindan (Sudan) ADIB US - Clarke 1880
Adindan (Mali) ADIC US - Clarke 1880
Adindan (Senegal) ADID US - Clarke 1880
Adindan (Burkina Faso) ADIE US - Clarke 1880
Adindan (Cameroon) ADIF US - Clarke 1880
Adindan (Mean value: Ethiopia and Sudan) ADIM US - Clarke 1880
Afgooye (Somalia) AFG Krassovsky (1940)
Antigua Island Astro 1943 AIA US - Clarke 1880
Ain el Abd 1970 AIN US - International 1924
Ain el Abd 1970 (Bahrain Island) AINA US - International 1924
Ain el Abd 1970 (Saudi Arabia) AINB US - International 1924
American Samoa Datum 1962 AMA Clarke 1866
Amersfoort 1885/1903 (Netherlands) AME US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Anna 1 Astro 1965 (Cocos Islands) ANO Australian National (1966)
Approximate Luzon Datum (Philippines) APL Clarke 1866
Arc 1950 ARF US - Clarke 1880
Arc 1950 (Botswana) ARFA US - Clarke 1880
Arc 1950 (Lesotho) ARFB US - Clarke 1880
Arc 1950 (Malawi) ARFC US - Clarke 1880
Arc 1950 (Swaziland) ARFD US - Clarke 1880
Arc 1950 (Zaire) ARFE US - Clarke 1880
Arc 1950 (Zambia) ARFF US - Clarke 1880
Arc 1950 (Zimbabwe) ARFG US - Clarke 1880
Arc 1950 (Burundi) ARFH US - Clarke 1880
Arc 1950 (Mean value: Botswana, Lesotho, Malawi, Swaziland, Zaire, Zambia, and Zimbabwe) ARFM US - Clarke 1880
Arc 1960 ARS US - Clarke 1880
Arc 1960 (Kenya) ARSA US - Clarke 1880
Arc 1960 (Tanzania) ARSB US - Clarke 1880
Arc 1960 (Mean value: Kenya, Tanzania) ARSM US - Clarke 1880
Arc 1935 (Africa) ART US - Clarke 1880
Ascension Island 1958 (Ascension Island) ASC US - International 1924
Montserrat Island Astro 1958 ASM US - Clarke 1880
Astro Station 1952 (Marcus Island) ASQ US - International 1924
Astro Beacon “E” (Iwo Jima Island) ATF US - International 1924
Average Terrestrial System 1977, New Brunswick, Nova Scotia, Prince Edward Island ATX Average Terrestrial System 1977
Australian Geod. 1966 (Australia and Tasmania Is.) AUA Australian National (1966)
Australian Geod. 1984 (Australia and Tasmania Is.) AUG Australian National (1966)
Djakarta (Batavia) (Sumatra Island, Indonesia) BAT US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Djakarta (Batavia) (Sumatra Island, Indonesia) with Zero Meridian Djakarta BAT1 US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Bekaa Base South End (Lebanon) BEK Clarke 1880 (IGN)
Belgium 1950 System (Lommel Signal, Belgium) BEL US - International 1924
Bermuda 1957 (Bermuda Islands) BER Clarke 1866
Bissau (Guinea-Bissau) BID US - International 1924
Modified BJZ54 (China) BJM Krassovsky (1940)
BJZ54 (A954 Beijing Coordinates) (China) BJZ Krassovsky (1940)
Bogota Observatory (Colombia) BOO US - International 1924
Bogota Observatory (Colombia) with Zero Meridian Bogota BOO1 US - International 1924
Bern 1898 (Switzerland) BRE US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Bern 1898 (Switzerland) with Zero Meridian Bern BRE1 US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Bukit Rimpah (Bangka & Belitung Islands, Indonesia) BUR US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Cape Canaveral (Mean value: Florida and Bahama Islands) CAC Clarke 1866
Campo Inchauspe (Argentina) CAI US - International 1924
Camacupa Base SW End (Campo De Avianco, Angola) CAM US - Clarke 1880
Canton Astro 1966 (Phoenix Islands) CAO US - International 1924
Cape (South Africa) CAP Clarke 1880 (Cape)
Camp Area Astro (Camp McMurdo Area, Antarctica) CAZ US - International 1924
S-JTSK, Czechoslovakia (prior to 1 Jan 1993) CCD US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Carthage (Tunisia) CGE Clarke 1880 (IGN)
Compensation Geodesique du Quebec 1977 CGX Clarke 1866
Chatham 1971 (Chatham Island, New Zealand) CHI US - International 1924
Chua Astro (Paraguay) CHU US - International 1924
Corrego Alegre (Brazil) COA US - International 1924
Conakry Pyramid of the Service Geographique (Guinea) COV Clarke 1880 (IGN)
Guyana CSG67 CSG US - International 1924
Dabola (Guinea) DAL US - Clarke 1880
DCS-3 Lighthouse, Saint Lucia, Lesser Antilles DCS US - Clarke 1880
Deception Island, Antarctica DID US - Clarke 1880
GUX 1 Astro (Guadacanal Island) DOB US - International 1924
Dominica Astro M-12, Dominica, Lesser Antilles DOM  
Easter Island 1967 (Easter Island) EAS US - International 1924
Wake-Eniwetok 1960 (Marshall Islands) ENW Hough 1960
European 1950 EUR US - International 1924
European 1950 (Western Europe: Austria, Denmark, France, Federal Republic of Germany, Netherlands, and Switzerland) EURA US - International 1924
European 1950 (Greece) EURB US - International 1924
European 1950 (Norway and Finland) EURC US - International 1924
European 1950 (Portugal and Spain) EURD US - International 1924
European 1950 (Cyprus) EURE US - International 1924
European 1950 (Egypt) EURF US - International 1924
European 1950 (England, Channel Islands, Scotland, and Shetland Islands) EURG US - International 1924
European 1950 (Iran) EURH US - International 1924
European 1950 (Sardinia) EURI US - International 1924
European 1950 (Sicily) EURJ US - International 1924
European 1950 (England, Channel Islands, Ireland, Northern Ireland, Scotland, Shetland Islands, and Wales) EURK US - International 1924
European 1950 (Malta) EURL US - International 1924
European 1950 (Mean value: Austria, Belgium, Denmark, Finland, France, Federal Republic of Germany, Gibraltar, Greece, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, & Switzerland) EURM US - International 1924
European 1950 (Iraq, Israel, Jordan, Kuwait, Lebanon, Saudi Arabia, and Syria) EURS US - International 1924
European 1950 (Tunisia) EURT US - International 1924
European 1979 (Mean value: Austria, Finland, Netherlands, Norway, Spain, Sweden, and Switzerland) EUS US - International 1924
European Terrestrial Reference System 1989 (ETRS89) EUT Geodetic Reference System 1980
Oman (Oman) FAH US - Clarke 1880
Observatorio Meteorologico 1939 (Corvo and Flores Islands, Azores) FLO US - International 1924
Fort Thomas 1955 (Nevis, St Kitts, Leeward Islands) FOT US - Clarke 1880
Gan 1970 (Addu Atoll, Republic of Maldives) GAA US - International 1924
Gandajika Base (Zaire) GAN US - International 1924
Geocentric Datum of Australia (GDA) GDS Geodetic Reference System 1980
GDZ80 (China) GDZ IAG Best Estimate 1975
Geodetic Datum 1949 (New Zealand) GEO US - International 1924
DOS 1968 (Gizo Island, New Georgia Islands) GIZ US - International 1924
Graciosa Base SW (Faial, Graciosa, Pico, Sao Jorge, and Terceira Island, Azores) GRA US - International 1924
Greek Datum, Greece GRK US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Greek Geodetic Reference System 1987 (GGR 87) GRX Geodetic Reference System 1980
Gunong Segara (Kalimantan Island, Indonesia) GSE US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Gunong Serindung GSF US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Guam 1963 GUA Clarke 1866
Herat North (Afganistan) HEN US - International 1924
Hermannskogel HER US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Provisional South Chilean 1963 (or Hito XVIII 1963) (S. Chile, 53°S) HIT US - International 1924
Hjorsey 1955 (Iceland) HJO US - International 1924
Hong Kong 1963 (Hong Kong) HKD US - International 1924
Hong Kong 1929 HKO Clarke 1858
Hu-Tzu-Shan HTN US - International 1924
Hungarian 1972 HUY Geodetic Reference System 1967
Bellevue (IGN) (Efate and Erromango Islands) IBE US - International 1924
Indonesian 1974 IDN Indonesian National (1974)
Indian IND  
Indian (Thailand and Vietnam) INDA  
Indian (Bangladesh) INDB US - Everest (India 1830)
Indian (India and Nepal) INDI US - Everest (India 1956)
Indian (Pakistan) INDP Everest (Pakistan)
Indian (1954) INF US - Everest (India 1830)
Indian 1954 (Thailand) INFA US - Everest (India 1830)
Indian 1960 ING US - Everest (India 1830)
Indian 1960 (Vietnam: near 16°N) INGA US - Everest (India 1830)
Indian 1960 (Con Son Island (Vietnam)) INGB US - Everest (India 1830)
Indian 1975 INH US - Everest (India 1830)
Indian 1975 (Thailand) INHA US - Everest (India 1830)
Ireland 1965 (Ireland and Northern Ireland) IRL US - Modified Airy
ISTS 061 Astro 1968 (South Georgia Islands) ISG US - International 1924
ISTS 073 Astro 1969 (Diego Garcia) IST US - International 1924
Johnston Island 1961 (Johnston Island) JOH US - International 1924
Kalianpur (India) KAB US - Everest (India 1956)
Kandawala (Sri Lanka) KAN US - Everest (India 1830)
Kertau 1948 (or Revised Kertau) (West Malaysia and Singapore) KEA US - Everest (W. Malaysia and Singapore 1948)
KCS 2, Sierra Leone KCS US - War Office 1924 (McCaw)
Kerguelen Island 1949 (Kerguelen Island) KEG US - International 1924
Korean Geodetic System 1995 (South Korea) KGS Geodetic Reference System 1980
KKJ (or Kartastokoordinaattijarjestelma), Finland KKX US - International 1924
Kusaie Astro 1951 KUS US - International 1924
Kuwait Oil Company (K28) KUW US - Clarke 1880
L.C. 5 Astro 1961 (Cayman Brac Island) LCF Clarke 1866
Legion (Ghana) LEH US - Clarke 1880
Liberia 1964 (Liberia) LIB US - Clarke 1880
Lisbon (Castelo di Sao Jorge), Portugal LIS  
Local Astro. LOC  
Loma Quintana (Venezuela) LOM US - International 1924
Luzon LUZ Clarke 1866
Luzon (Philippines except Mindanao Island) LUZA Clarke 1866
Luzon (Mindanao Island) LUZB Clarke 1866
Marco Astro (Salvage Islands) MAA US - International 1924
Martinique Fort-Desaix MAR US - International 1924
Massawa (Eritrea, Ethiopia) MAS US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Manokwari (West Iran) MAW  
Mayotte Combani MCX US - International 1924
Mount Dillon, Tobago MDT Clarke 1858 (Modified)
Merchich (Morocco) MER Clarke 1880 (IGN)
Midway Astro 1961 (Midway Island) MID US - International 1924
Mahe 1971 (Mahe Island) MIK US - Clarke 1880
Minna MIN US - Clarke 1880
Minna (Cameroon) MINA US - Clarke 1880
Minna (Nigeria) MINB US - Clarke 1880
Rome 1940 (or Monte Mario 1940), Italy MOD US - International 1924
Rome 1940 (or Monte Mario 1940), Italy, with Zero Meridian Rome MOD1 US - International 1924
Montjong Lowe MOL US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
M’Poraloko (Gabon) MPO US - Clarke 1880
Viti Levu 1916 (Viti Levu Island, Fiji Islands) MVS US - Clarke 1880
Nahrwan NAH US - Clarke 1880
Nahrwan (Masirah Island, Oman) NAHA US - Clarke 1880
Nahrwan (United Arab Emirates) NAHB US - Clarke 1880
Nahrwan (Saudi Arabia) NAHC US - Clarke 1880
Naparima (BWI, Trinidad and Tobago) NAP US - International 1924
North American 1983 NAR Geodetic Reference System 1980
North American 1983 (Alaska, excluding Aleutian Islands) NARA Geodetic Reference System 1980
North American 1983 (Canada) NARB Geodetic Reference System 1980
North American 1983 (CONUS) NARC Geodetic Reference System 1980
North American 1983 (Mexico and Central America) NARD Geodetic Reference System 1980
North American 1983 (Aleutian Islands) NARE Geodetic Reference System 1980
North American 1983 (Hawaii) NARH Geodetic Reference System 1980
North American 1927 NAS Clarke 1866
North American 1927 (Eastern US) NASA Clarke 1866
North American 1927 (Western US) NASB Clarke 1866
North American 1927 (Mean value: CONUS) NASC Clarke 1866
North American 1927 (Alaska) NASD Clarke 1866
North American 1927 (Mean value: Canada) NASE Clarke 1866
North American 1927 (Alberta and British Columbia) NASF Clarke 1866
North American 1927 (Newfoundland, New Brunswick, Nova Scotia and Quebec) NASG Clarke 1866
North American 1927 (Manitoba and Ontario) NASH Clarke 1866
North American 1927 (Northwest Territories and Saskatchewan) NASI Clarke 1866
North American 1927 (Yukon) NASJ Clarke 1866
North American 1927 (Mexico) NASL Clarke 1866
North American 1927 (Central America – Belize, Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua) NASN Clarke 1866
North American 1927 (Canal Zone) NASO Clarke 1866
North American 1927 (Caribbean, Barbados, Caicos Islands, Cuba, Dominican Republic, Grand Cayman, Jamaica, Leeward Islands, and Turks Islands) NASP Clarke 1866
North American 1927 (Bahamas, except San Salvador Island) NASQ Clarke 1866
North American 1927 (San Salvador Island) NASR Clarke 1866
North American 1927 (Cuba) NAST Clarke 1866
North American 1927 (Hayes Peninsula, Greenland) NASU Clarke 1866
North American 1927 (Aleutian Islands East of 180°W) NASV Clarke 1866
North American 1927 (Aleutian Islands West of 180°W) NASW Clarke 1866
Revised Nahrwan NAX US - Clarke 1880
New French or Nouvelle Triangulation Francaise (NTF) with Zero Meridian Paris NFR1 or FDA Clarke 1880 (IGN)
North Sahara 1959 NSD US - Clarke 1880
Ocotopeque, Guatemala OCO  
Belgium 1972 (Observation d’Uccle) ODU US - International 1924
Old Egyptian (Egypt) OEG Helmert 1906
Ordnance Survey of Great Britain 1936 OGB Airy (1830)
Ordnance Survey G.B. 1936 (England) OGBA Airy (1830)
Ordnance Survey G.B. 1936 (England, Isle of Man, and Wales) OGBB Airy (1830)
Ordnance Survey G.B. 1936 (Scotland and Shetland Islands) OGBC Airy (1830)
Ordnance Survey G.B. 1936 (Wales) OGBD Airy (1830)
Ordnance Survey G.B. 1936 (Mean value: England, Isle of Man, Scotland, Shetland, and Wales) OGBM Airy (1830)
Old Hawaiian OHA Clarke 1866
Old Hawaiian (Hawaii) OHAA Clarke 1866
Old Hawaiian (Kauai) OHAB Clarke 1866
Old Hawaiian (Maui) OHAC Clarke 1866
Old Hawaiian (Oahu) OHAD Clarke 1866
Old Hawaiian (Mean value) OHAM Clarke 1866
Oslo Observatory (Old), Norway OSL Bessel (Modified)
Padang Base West End (Sumatra, Indonesia) PAD US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Padang Base West End (Sumatra, Indonesia) with Zero Meridian Djakarta PAD1 US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Palestine 1928 (Israel, Jordan) PAL Clarke 1880 (Palestine)
Potsdam or Helmertturm (Germany) PDM US - International 1924
Ayabelle Lighthouse (Djibouti) PHA US - Clarke 1880
Pitcairn Astro 1967 (Pitcairn Island) PIT US - International 1924
Pico de las Nieves (Canary Islands) PLN US - International 1924
SE Base (Porto Santo) (Porto Santo & Madeira Islands) POS US - International 1924
Provisional South American 1956 PRP US - International 1924
Prov. S. American 1956 (Bolivia) PRPA US - International 1924
Prov. S. American 1956 (Northern Chile near 19°S) PRPB US - International 1924
Prov. S. American 1956 (Southern Chile near 43°S) PRPC US - International 1924
Prov. S. American 1956 (Columbia) PRPD US - International 1924
Prov. S. American 1956 (Ecuador) PRPE US - International 1924
Prov. S. American 1956 (Guyana) PRPF US - International 1924
Prov. S. American 1956 (Peru) PRPG US - International 1924
Prov. S. American 1956 (Venezuela) PRPH US - International 1924
Prov. S. American 1956 (Mean value: Bolivia, Chile, Columbia, Ecuador, Guyana, Peru, & Venezuela) PRPM US - International 1924
Point 58 Mean Solution (Burkina Faso and Niger) PTB US - Clarke 1880
Pointe Noire 1948 PTN US - Clarke 1880
Pulkovo 1942 (Russia) PUK Krassovsky (1940)
Puerto Rico (Puerto Rico and Virgin Islands) PUR Clarke 1866
Qatar National (Qatar) QAT US - International 1924
Qornoq (South Greenland) QUO US - International 1924
Rauenberg (Berlin, Germany) RAU US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Reconnaissance Triangulation, Morocco REC Clarke 1880 (IGN)
Santo (DOS) 1965 (Espirito Santo Island) SAE US - International 1924
South African (South Africa) SAF US - Clarke 1880
Sainte Anne I 1984 (Guadeloupe) SAG  
South American 1969 SAN South American
South American 1969 (Argentina) SANA South American
South American 1969 (Bolivia) SANB South American
South American 1969 (Brazil) SANC South American
South American 1969 (Chile) SAND South American
South American 1969 (Columbia) SANE South American
South American 1969 (Ecuador) SANF South American
South American 1969 (Guyana) SANG South American
South American 1969 (Paraguay) SANH South American
South American 1969 (Peru) SANI South American
South American 1969 (Baltra, Galapagos Islands) SANJ South American
South American 1969 (Trinidad and Tobago) SANK South American
South American 1969 (Venezuela) SANL South American
South American 1969 (Mean value: Argentina, Bolivia, Brazil, Chile, Columbia, Ecuador, Guyana, Paraguay, Peru, Trinidad and Tobago, and Venezuela) SANM South American
Sao Braz (Sao Miguel, Santa Maria Islands, Azores) SAO US - International 1924
Sapper Hill 1943 (East Falkland Islands) SAP US - International 1924
Schwarzeck (Namibia) SCK Bessel 1841 (Namibia)
Soviet Geodetic System 1985 SGA Soviet Geodetic System 1985
Soviet Geodetic System 1990 SGB Soviet Geodetic System 1985
Selvagem Grande 1938 (Salvage Islands) SGM US - International 1924
Astro DOS 71/4 (St. Helena Island) SHB US - International 1924
Sierra Leone 1960 SIB US - Clarke 1880
South Asia (Southeast Asia, Singapore) SOA US - Modified Fischer 1960 (South Asia)
S-42 (Pulkovo 1942) SPK Clarke 1866
St. Pierre et Miquelon 1950 SPX Clarke 1866
Stockholm 1938 (Sweden) STO US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Sydney Observatory, New South Wales, Australia SYO Clarke 1858 (Modified)
Tananarive Observatory 1925 TAN US - International 1924
Tananarive Observatory 1925, with Zero Meridian Paris TAN1 US - International 1924
Tristan Astro 1968 (Tristan da Cunha) TDC US - International 1924
Timbalai 1948 (Brunei and East Malaysia – Sarawak and Sabah) TIL US - Everest (Brunei and E. Malaysia (Sabah and Sarawak))
Timbalai 1968 TIN US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Tokyo TOY US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Tokyo (Japan) TOYA US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Tokyo (Korea) TOYB US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Tokyo (Okinawa) TOYC US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Tokyo (Mean value: Japan, Korea, and Okinawa) TOYM US - Bessel 1841 (Ethiopia, Indonesia, Japan, Korea)
Trinidad 1903 TRI Clarke 1858
Astro Tern Is. 1961 (Tern Island, Hawaii) TRN US - International 1924
Voirol 1875 VOI Clarke 1880 (IGN)
Voirol 1875 with Zero Meridian Paris VOI1 Clarke 1880 (IGN)
Wake Island Astro 1952 WAK US - International 1924
World Geodetic System 1960 WGA World Geodetic System 1960
World Geodetic System 1966 WGB World Geodetic System 1966
World Geodetic System 1972 WGC World Geodetic System 1972
World Geodetic System 1984 WGE World Geodetic System 1984
Yacare (Uruguay) YAC US - International 1924
Zanderij (Surinam) ZAN US - International 1924
Within the context of DIGEST, vertical datums were referenced in one of two ways: Geodetic or Gravity-Related. These are not the only conceivable vertical datums of course, but these two categories sufficed for the needs of the DIGEST at the time.

The horizontal datums in the preceding table are also examples of Geodetic vertical datums in the case where the elevation is measured relative to the ellipsoid described by the horizontal datum.

Under DIGEST, Gravity-Related vertical datums were either referenced in some manner to Mean Sea Level (MSL) (in which case they could be called Sounding Datums) or to a Geopotential Model such as the EGM96 Model Geoid (see DIGEST for specific definitions of these terms).

The following table provides the DIGEST codes for various Sounding Datums, which were vertical datums used to measure water depth; these individual sounding datums were defined in the IHO hydrographic Dictionary in use at the time DIGEST was published.

Sounding Datum from DIGEST DIGEST Code
Approximate Lowest Astronomical Tide ALAT
Approximate Mean Low Water Springs AMLS
Approximate Mean Low Water Tide AMLT
Approximate Mean Low Water AMLW
Approximate Mean Sea Level AMSL
Chart Datum (Unspecified) CD
Equinoctial Spring Low Water ESLW
Highest Astronomical Tide HAT
Higher High Water Large Tide HHLT
Highest Normal High Water HNHR
Higher High Water HRHW
Highest High Water HTHW
High Water HW
High Water Springs HWS
International Great Lakes Datum 1985 IGLD
Indian Spring High Water ISHW
Indian Spring Low Water ISLW
Lowest Astronomical Tide LAT
Local Datum (arbitrary datum defined by local harbour authority) LD
Lower Low Water Large Tide LLLT
Lowest Low Water Springs LLWS
Lower Low Water LRLW
Lowest Low Water LTLW
Low Water LW
Low Water Springs LWS
Mean Higher High Water MHHW
Mean Higher Water MHRW
Mean High Water MHW
Mean High Water Neaps MHWN
Mean High Water Springs MHWS
Mean Lower Low Water Springs MLLS
Mean Lower Low Water MLLW
Mean Low Water MLW
Mean Low Water Neaps MLWN
Mean Low Water Springs MLWS
Mean Sea MSL
Mean Tide Level MTL
Nearly Lowest Low Water NLLW
Neap Tide NT
Spring Tide ST


-- ChrisLittle - 20 Nov 2014
Topic revision: r2 - 20 Nov 2014, JasonSmith
 

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