Tuesday, October 14, 2014

The greatest maps in history, collected in one fantastic book

Made in 1500, Jacopo De'Barbari's woodcut map of Venice is the first known birds-eye view of any city.
Predating modern surveying techniques, the cartographer achieved his impressively accurate scale by building a custom geometric grid before overlaying the city's buildings, canals, and labyrinthine streets.
Rreproduced by permission of DK, a division of Penguin Random House ©2014

From Wired by Nick Stockton

Maps are more than a measure of space; they are also records of how humans have understood, examined, and reconsidered the earth throughout history.
In his new book, Great Maps, Jerry Brotton uses over 60 milestones to guide us through our cartographic heritage.

Petrus Plancius' map to the riches of the Moluccas was the first successful attempt
to convince mariners that the Mercator projection was a useful navigational tool.
The State Library of New South Wales

“A map is about space, but it is also an object in time,” said Brotton, a professor of Renaissance studies at Queen Mary College in London.
They tell stories: how far-reaching the borders were of a great civilization, or what another culture believed about Earth’s place in the cosmos.
For Brotton, some of the most fascinating map stories are about how humans have solved complex cartographic problems.


The Korean-made Kangnido map (c.1402) is dominated by Ming China, which was Asia's dominant regional power.
Like other Asian mapmakers, Cartographer Kwŏn Kŭn emphasized rivers because they were viewed as arteries for terrestrial energy.

For instance, measuring space is an innovation we often take for granted, but it was a problem solved over great swaths of time and in several different cultures.
No matter when or where they were born, sailors have always needed tools to help them travel safely from one place to another, and this has consistently been one of the biggest motivators for creating accurate methods of measurement.

 Joan Blaeu's 1648 copperplate engraving was the first map to acknowledge that the Earth circled the sun.
Despite his forward-thinking heliocentrism, Blaeu couldn't resist preserving the myth of California as an island.

In the west, this evolved with Ptolemaic lines of latitude and longitude, compasses, and lines of bearing like those in the Carte Pisan.
Other cultures had their own, no less ingenious ways of solving the challenges of ocean navigation, such as the stick charts that Pacific Islanders used to colonize hundreds of remote islands.


Native sailors of the Marshall Islands in the south Pacific developed their own sophisticated navigational charts.
The curved sticks indicate swells, the horizontals measure distance between islands, and the chevrons show how swells refract around important islands.
These charts allowed Pacific Island culture to propagate among hundreds of remote islands.

Brotton explains that he took special care in choosing the maps in his book so he could emphasize the importance of these stories.
“When you make a book called Great Maps, there is a central spine of maps that people in the field expect to see,” he explains, listing Ptolemy‘s and Mercator‘s maps as canonical examples. “But alongside those I wanted to tell other stories,” he says.
In this a way, Great Maps is a broader, illustrated successor to Brotton’s last book of cartographic history, A History of the World in 12 Maps.
The recurring theme in both is that maps, in a addition to showing geographic information, also betray the values and biases of their makers.


Like most early Islamic world maps, Al-Sharīf al-Idrīsī's 1154 "Entertainment for He Who Longs to Travel the World" is oriented towards the south.
The mountains in the middle of Africa were believed to be the source of the Nile.

“European maps are known for being more objective and scientific than the other great mapping cultures,” he said, which is a by-product of the European nations’ colonial ambitions.
“But Islamic culture was much less concerned with colonizing new territory, and their maps emphasize a consolidation of the empire and its cultural ideas.”
Similarly, Chinese and Korean cultures were relatively insular, and their maps tend to focus on cultural harmony.
Because the landscape was believed to affect this harmony, those cultures’ maps paid special attention to the arrangement of rivers and other natural features, Brotton says.

It took until 1710 for someone to explore California thoroughly enough to prove it was not an island.
Unfortunately, because the explorer, Eusebio Kino, was a missionary and (despite his obvious mapmaking ability evinced above) not a trained cartographer, nobody believed him.

Each culture had its own word for these tools that look at the world from above.
In the West, ‘map,’ comes from the Latin ‘mappa,’ which means cloth or napkin.
In Arabic a map is ‘surah’ —a figure—and in Chinese it’s ‘tu’—usually meaning a diagram.
“All these words describe slightly different manifestations of what we in the modern west designate as a map,” he said.
“And, they’re all connected to how those cultures view the world.”

Monday, October 13, 2014

UK & misc. update in the Marine GeoGarage

As our public viewer is not yet available
(currently under construction, upgrading to Google Maps API v3 as v2 is officially no more supported),
this info is primarily intended to our B2B customers which use our nautical charts layers in their own webmapping applications through our GeoGarage API.

Today 951 charts (1815 including sub-charts) from UKHO
are available in the 'UK & misc.' chart layer
regrouping charts for different countries :
  1. UK
  2. Argentina
  3. Belgium
  4. Netherlands
  5. Croatia
  6. Oman
  7. Portugal
  8. Spain
  9. Iceland
  10. South Africa
  11. Malta
 2 charts have been withdrawn (813, 3764) since the last update
and 1 chart has been added (3492)


634 charts for UK
(1 chart withwdrawn 813 Colombo to Sangama Kanda Point;
1 chart added 3492 Approaches to Port Sudan)

24 charts for Argentina :

  • 226    International Chart Series, Antarctica - South Shetlands Islands, Deception Island.
  • 227    Church Point to Cape Longing including James Ross Island
  • 531    Plans on the Coast of Argentina
  • 552    Plans on the Coast of Argentina
  • 557    Mar del Plata to Comodoro Rivadavia
  • 1302    Cabo Guardian to Punta Nava
  • 1331    Argentina, Approaches to Bahia Blanca
  • 1332    Isla de los Estados and Estrecho de le Maire
  • 1751    Puerto de Buenos Aires
  • 1982B    Rio Parana - Rosario to Parana
  • 2505    Approaches to the Falkland Islands
  • 2517    North-Western Approaches to the Falkland Islands
  • 2519    South-Western Approaches to the Falkland Islands
  • 3065    Punta Piedras to Quequen
  • 3066    Quequen to Rio Negro
  • 3067    Rio Negro to Isla Leones
  • 3106    Isla Leones to Pto San Julian
  • 3213    Plans in Graham Land
  • 3560    Gerlache Strait  Northern Part
  • 3566    Gerlache Strait  Southern Part
  • 3755    Bahia Blanca
  • 4063    Bellingshausen Sea to Valdivia
  • 4200    Rio de la Plata to Cabo de Hornos
  • 4207    Falkland Islands to Cabo Corrientes and Northeast Georgia Rise
27 charts for Belgium & Nederlands :

  • 99 Entrances to Rivers in Guyana and Suriname
  • 110 Westkapelle to Stellendam and Maasvlakte
  • 112 Terschellinger Gronden to Harlingen
  • 120 Westerschelde - Vlissingen to Baalhoek and Gent - Terneuzen Canal
  • 122 Approaches to Europoort and Hoek van Holland
  • 124 Noordzeekanaal including Ijmuiden, Zaandam and Amsterdam
  • 125 North Sea Netherlands - Approaches to Scheveningen and Ijmuiden
  • 126 North Sea, Netherlands, Approaches to Den Helder
  • 128 Westerschelde, Valkenisse to Wintam
  • 207 Hoek Van Holland to Vlaardingen
  • 208 Rotterdam, Nieuwe Maas and Oude Maas
  • 209 Krimpen a/d Lek to Moerdijk
  • 266 North Sea Offshore Charts Sheet 11
  • 572 Essequibo River to Corentyn River
  • 702 Nederlandse Antillen, Aruba and Curacao
  • 1187 Outer Silver Pit
  • 1408 North Sea, Harwich and Rotterdam to Cromer and Terschelling.
  • 1412 Caribbean Sea - Nederlandse Antillen, Ports in Aruba and Curacao
  • 1414 Bonaire
  • 1503 Outer Dowsing to Smiths Knoll including Indefatigable Banks.
  • 1504 Cromer to Orford Ness
  • 1546 Zeegat van Texel and Den Helder Roads
  • 1630 West Hinder and Outer Gabbard to Vlissingen and Scheveningen
  • 1631 DW Routes to Ijmuiden and Texel
  • 1632 DW Routes and Friesland Junction to Vlieland
  • 1874 North Sea, Westerschelde, Oostende to Westkapelle
  • 2047 Approaches to Anguilla

13 charts for Croatia :
  • 201 Rt Kamenjak to Novigrad
  • 202 Kvarner, Kvarneric and Velebitski Kanal
  • 269 Ploce and Split with Adjacent Harbours, Channels and Anchorages
  • 515 Zadar to Luka Mali Losinj
  • 680 Dubrovnik
  • 1574 Otok Glavat to Ploce and Makarska
  • 1580 Otocic Veliki Skolj to Otocic Glavat
  • 1996 Ports in Rijecki Zaljev
  • 2711 Rogoznica to Zadar
  • 2712 Otok Susac to Split
  • 2719 Rt Marlera to Senj including Approaches to Rijeka
  • 2773 Sibenik, Pasmanski Kanal, Luka Telascica, Sedmovrace, Rijeka Krka
  • 2774 Otok Vis to Sibenik
 7 charts for Oman :

  • 2853 Gulf of Oman, approaches to Sohar       
  • 2854 Northern approaches to Masirah
  • 3171 Southern Approaches to the Strait of Hormuz
  • 3409 Plans in Iran, Oman and the United Arab Emirates
  • 3511 Wudam and Approaches
  • 3518 Ports and Anchorages on the North East Coast of Oman
  • 3762 Oman - South East coast, Ad Duqm


125 charts for Spain & Portugal :
(1 chart withdrawn, 3764)
  • 45 Gibraltar Harbour
  • 73 Puerto de Huelva and Approaches
  • 83 Ports on the South Coast of Portugal
  • 85 Spain - south west coast, Rio Guadalquivir
  • 86 Bahia de Cadiz
  • 87 Cabo Finisterre to the Strait of Gibraltar
  • 88 Cadiz
  • 89 Cabo de Sao Vicente to Faro
  • 91 Cabo de Sao Vicente to the Strait of Gibraltar
  • 93 Cabo de Santa Maria to Cabo Trafalgar
  • 142 Strait of Gibraltar
  • 144 Mediterranean Sea, Gibraltar
  • 307 Angola, Cabeca da Cobra to Cabo Ledo
  • 308 Angola, Cabo Ledo to Lobito
  • 309 Lobito to Ponta Grossa
  • 312 Luanda to Baia dos Tigres
  • 366 Arquipelago de Cabo Verde
  • 469 Alicante
  • 473 Approaches to Alicante
  • 518 Spain East Coast, Approaches to Valencia
  • 562 Mediterranean Sea, Spain - East Coast, Valencia.
  • 580 Al Hoceima, Melilla and Port Nador with Approaches
  • 659 Angola, Port of Soyo and Approaches
  • 690 Cabo Delgado to Mikindani Bay
  • 1094 Rias de Ferrol, Ares, Betanzos and La Coruna
  • 1096 Ribadeo
  • 1110 La Coruna and Approaches
  • 1111 Punta de la Estaca de Bares to Cabo Finisterre
  • 1113 Harbours on the North-West Coast of Spain
  • 1117 Puerto de Ferrol
  • 1118 Ria de Ferrol
  • 1122 Ports on the North Coast of Spain
  • 1133 Ports on the Western Part of the North Coast of Spain
  • 1142 Ria de Aviles
  • 1145 Spain - North Coast, Santander
  • 1150 Ports on the North Coast of Spain
  • 1153 Approaches to Gijon
  • 1154 Spain, north coast, Gijon
  • 1157 Pasaia (Pasajes) and Approaches
  • 1172 Puertos de Bermeo and Mundaka
  • 1173 Spain - North Coast, Bilbao
  • 1174 Approaches to Bilbao
  • 1180 Barcelona
  • 1189 Approaches to Cartagena
  • 1193 Spain - east coast, Tarragona
  • 1194 Cartagena
  • 1196 Approaches to Barcelona
  • 1197 Plans on the West Coast of Africa
  • 1215 Plans on the Coast of Angola
  • 1216 Baia dos Tigres
  • 1290 Cabo de San Lorenzo to Cabo Ortegal
  • 1291 Santona to Gijon
  • 1448 Gibraltar Bay
  • 1453 Gandia
  • 1455 Algeciras
  • 1460 Sagunto
  • 1514 Spain - East Coast, Castellon
  • 1515 Ports on the East Coast of Spain
  • 1589 Almeria
  • 1595 Ilhas do Principe, de Sao Tome and Isla Pagalu
  • 1684 Ilha da Madeira, Manchico and Canical
  • 1685 Ilha de Madeira, Ponta Gorda de Sao Lourenco including the Port of Funchal
  • 1689 Ports in the Arquipelago da Madeira
  • 1701 Cabo de San Antonio to Vilanova I la Geltru including Islas de Ibiza and Formentera
  • 1703 Mallorca and Menorca
  • 1704 Punta de la Bana to Islas Medas
  • 1724 Canal do Geba and Bissau
  • 1726 Approaches to Canal do Geba and Rio Cacheu
  • 1727 Bissau, Bolama and Approaches
  • 1730 Spain - West Coast, Ria de Vigo
  • 1731 Vigo
  • 1732 Spain - West Coast, Ria de Pontevedra
  • 1733 Spain - West Coast, Marin and Pontevedra
  • 1734 Approaches to Ria de Arousa
  • 1740 Livingston Island, Bond Point to Brunow Bay including Juan Carlos 1 Base and Half Moon Island
  • 1755 Plans in Ria de Arousa
  • 1756 Ria de Muros
  • 1762 Vilagarcia de Arosa
  • 1764 Ria de Arousa
  • 1831 Arquipelago da Madeira
  • 1847 Santa Cruz de Tenerife
  • 1850 Approaches to Malaga
  • 1851 Malaga
  • 1854 Motril and Adra
  • 1856 Approaches to Puerto de La Luz (Las Palmas)
  • 1858 Approaches to Santa Cruz de Tenerife, Puerto de San Sebastian de la Gomera, Santa Cruz de la Palma and Approaches
  • 1861 North Atlantic Ocean – Islas Canarias, Gran Canaria to El Hierro 
  • 1862 North Atlantic Ocean – Islas Canarias, Lanzarote to Cabo Bojador  
  • 1863 Islas Canarias, Puerto de los Marmoles to Puerto del Rosario  
  • 1895 Ilha de Sao Miguel
  • 1950 Arquipelago dos Acores
  • 1956 Arquipelago dos Acores  Central Group
  • 1957 Harbours in the Arquipelago Dos Acores (Central Group)
  • 1959 Flores,Corvo and Santa Maria with Banco Das Formigas
  • 2742 Cueta
  • 2761 Menorca
  • 2762 Menorca, Mahon
  • 2831 Punta Salinas to Cabo de Formentor including Canal de Menorca
  • 2832 Punta Salinas to Punta Beca including Isla de Cabrera
  • 2834 Ibiza and Formentera
  • 2932 Cabo de Sao Sebastiao to Beira
  • 2934 Africa - east coast, Mozambique, Beira to Rio Zambeze
  • 2935 Quelimane to Ilha Epidendron
  • 3034 Approaches to Palma
  • 3035 Palma
  • 3220 Entrance to Rio Tejo including Baia de Cascais
  • 3221 Lisboa, Paco de Arcos to Terreiro do Trigo
  • 3222 Lisboa, Alcantara to Canal do Montijo
  • 3224 Approaches to Sines
  • 3227 Aveiro and Approaches
  • 3228 Approaches to Figueira da Foz
  • 3257 Viana do Castelo and Approaches
  • 3258 Approaches to Leixoes and Barra do Rio Douro
  • 3259 Approaches to Setubal
  • 3260 Carraca to Ilha do Cavalo
  • 3291 Angola, (Cabinda), Cabinda and Malongo Terminals    
  • 3448 Plans in Angola
  • 3578 Eastern Approaches to the Strait of Gibraltar
  • 3633 Islas Sisargas to Rio Mino
  • 3634 Montedor to Cabo Mondego
  • 3635 Cabo Mondego to Cabo Espichel
  • 3636 Cabo Espichel to Cabo de Sao Vicente
  • 4114 Arquipelago dos Acores to Flemish Cap
  • 4115 Arquipelago dos Acores to the Arquipelago de Cabo Verde



14 charts for Iceland :

  • 2733 Dyrholaey to Snaefellsjokull
  • 2734 Approaches to Reykjavik
  • 2735 Iceland - South West Coast, Reykjavik
  • 2897 Iceland
  • 2898 Vestfirdir
  • 2899 Iceland, Noth Coast, Horn to Rauoinupur
  • 2900 Iceland, North East Coast, Rauoinupur to Glettinganes
  • 2901 Iceland, East Coast, Glettinganes to Stokksnes
  • 2902 Stokksnes to Dyrholaey
  • 2955 Iceland, North Coast, Akureyri
  • 2956 Iceland, North Coast, Eyjafjordur
  • 2937 Hlada to Glettinganes
  • 2938 Reydarfjordur
  • 4112 North Atlantic Ocean, Iceland to Greenland


48 charts for South Africa :

  • 578    Cape Columbine to Cape Seal
  • 632    Hollandsbird Island to Cape Columbine
  • 643    Durban Harbour
  • 665    Approaches to Zanzibar
  • 1236    Saldanha Bay
  • 1806    Baia dos Tigres to Conception Bay
  • 1846    Table Bay Docks and Approaches
  • 1922    RSA - Simon's Bay
  • 2078    Port Nolloth to Island Point
  • 2095    Cape St Blaize to Port S. John's
  • 3211    Zanzibar Harbour
  • 3793    Shixini Point to Port S Johns
  • 3794    Port S Johns to Port Shepstone
  • 3795    Port Shepstone to Cooper Light
  • 3797    Green Point to Tongaat Bluff
  • 3859    Cape Cross to Conception Bay
  • 3860    Mutzel Bay to Spencer Bay
  • 3861    Namibia, Approaches to Luderitz
  • 3869    Hottentot Point to Chamais Bay
  • 3870    Chamais Bay to Port Nolloth
  • 4132    Kunene River to Sand Table Hill
  • 4133    Sand Table Hill to Cape Cross
  • 4136    Harbours on the West Coasts of Namibia and South Africa
  • 4141    Island Point to Cape Deseada
  • 4142    Saldanha Bay Harbour
  • 4145    Approaches to Saldanha Bay
  • 4146    Cape Columbine to Table Bay
  • 4148    Approaches to Table Bay
  • 4150    Republic of South Africa, South West Coast, Table Bay to Valsbaai
  • 4151    Cape Deseada to Table Bay
  • 4152    Republic of South Africa, South West Coast, Table Bay to Cape Agulhas
  • 4153    Republic of South Africa, South Coast, Cape Agulhas to Cape St. Blaize
  • 4154    Mossel Bay
  • 4155    Cape St Blaize to Cape St Francis
  • 4156    South Africa, Cape St Francis to Great Fish Point
  • 4157    South Africa, Approaches to Port Elizabeth
  • 4158    Republic of South Africa - South Coast, Plans in Algoa Bay.
  • 4159    Great Fish Point to Mbashe Point
  • 4160    Ngqura Harbour
  • 4162    Approaches to East London
  • 4163    Republic of South Africa, South East Coast, Mbashe Point to Port Shepstone
  • 4170    Approaches to Durban
  • 4171    Republic of South Africa – South East Coast, Port Shepstone to Tugela River
  • 4172    Tugela River to Ponta do Ouro
  • 4173    Approaches to Richards Bay
  • 4174    Richards Bay Harbour
  • 4205    Agulhas Plateau to Discovery Seamounts
  • 4700    Port Elizabeth to Mauritius 
    5 charts for Malta :

    • 36 Marsaxlokk
    • 177 Valletta Harbours
    • 211 Plans in the Maltese Islands
    • 2537 Ghawdex (Gozo), Kemmuna (Comino) and the Northern Part of Malta
    • 2538 Malta


    55 international charts from NGA
  •  3 Chagos Archipelago
  • 82 Outer Approaches to Port Sudan
  • 100 Raas Caseyr to Suqutra
  • 255 Eastern Approaches to Jamaica
  • 256 Western Approaches to Jamaica
  • 260 Pedro Bank to the South Coast of Jamaica
  • 333 Offshore Installations in the Gulf of Suez
  • 334 North Atlantic Ocean, Bermuda
  • 386 Yadua Island to Yaqaga Island
  • 390 Bahamas, Grand Bahama Island, Approaches to Freeport
  • 398 Grand Bahama Island, Freeport Roads, Freeport Harbour
  • 457 Portland Bight
  • 462 The Cayman Islands
  • 486 Jamaica and the Pedro Bank
  • 501 South East Approaches to Trinidad
  • 700 Maiana to Marakei
  • 868 Eastern and Western Approaches to The Narrows including Murray's Anchorage
  • 920 Chagos Archipelago, Diego Garcia
  • 928 Sulu Archipelago
  • 959 Colson Point to Belize City including Lighthouse Reef and Turneffe Islands
  • 1043 Saint Lucia to Grenada and Barbados
  • 1225 Gulf of Campeche
  • 1265 Approaches to Shatt Al 'Arab or Arvand Rud, Khawr Al Amaya and Khawr Al Kafka
  • 1450 Turks and Caicos Islands, Turks Island Passage and Mouchoir Passage
  • 1638 Plans in Northern Vanuatu
  • 2009 Sheet 2  From 23 deg 40 min North Latitude to Old Bahama Channel
  • 2065 Northern Antigua
  • 2133 Approaches to Suez Bay (Bahr el Qulzum)
  • 2373 Bahr el Qulzum (Suez Bay) to Ras Sheratib
  • 2374 Ra's Sharatib to Juzur Ashrafi
  • 2658 Outer Approaches to Mina` al Jeddah (Jiddah)
  • 2837 Strait of Hormuz to Qatar
  • 2847 Qatar to Shatt al `Arab
  • 3043 Red Sea, Ports on the coast of Egypt.
  • 3102 Takoradi and Sekondi Bays
  • 3175 Jazirat al Hamra' to Dubai (Dubayy) and Jazireh-ye Sirri
  • 3179 UAE and Qatar, Jazirat Das to Ar Ru' Ays
  • 3310 Africa - east coast, Mafia Island to Pemba Island
  • 3361 Wasin Island to Malindi
  • 3432 Saltpond to Tema
  • 3493 Red Sea - Sudan, Bashayer Oil Terminals and Approaches.
  • 3519 Southern Approaches to Masirah
  • 3520 Khawr Kalba and Dawhat Diba to Gahha Shoal
  • 3522 Approaches to Masqat and Mina' al Fahl
  • 3530 Approaches to Berbera
  • 3709 Gulf of Oman, United Arab Emirates, Port of Fujairah (Fujayrah) and Offshore Terminals.
  • 3723 Gulf of Oman, United Arab Emirates, Approaches to Khawr Fakkan and Fujairah (Fujayrah).
  • 3785 Mina' Raysut to Al Masirah
  • 3907 Bahama Islands and Hispaniola, Passages between Mayaguana Island and Turks and Caicos Islands.
  • 3908 Passages between Turks and Caicos Islands and Dominican Republic
  • 3910 Little Bahama Bank including North West Providence Channel
  • 3912 Bahamas, North East Providence Channel and Tongue of the Ocean
  • 3913 Bahamas, Crooked Island Passage and Exuma Sound
  • 3914 Turks and Caicos Islands and Bahamas, Caicos Passage and Mayaguana Passage
  • 3951 Sir Bani Yas to Khawr al `Udayd

AHS : importance of using official nautical charts

using official nautical charts from official Hydrographic Office

From AMSA & Safety4Sea

MARINE NOTICE 16/2014

Official Nautical Charts

This marine notice draws attention to the importance of using official nautical charts, issued by or on the authority of a Government, authorized Hydrographic Office or other relevant government institution so as to comply with applicable flag state requirements which implement Chapter V of the International Convention for the Safety of Life at Sea (SOLAS), as amended.

AHS offical raster charts with the Marine GeoGarage

Background

The Australian Maritime Safety Authority (AMSA) has recently observed an increase in the use of unofficial nautical charts on board ships for navigation.
Australia’s port State control program has recorded deficiencies and detained ships that have used unofficial nautical charts for navigation.

Unofficial nautical charts include but are not limited to: photocopies, facsimiles or imitations of official paper charts, large format commercial printed copies of scanned Electronic Navigational Charts, and paper charts “assembled” by printing several small portions of a Raster Navigational Chart.

Unofficial copies of nautical charts can be distorted, out of date or may omit important navigational features.
Charts assembled from small scanned portions of official nautical charts may be misaligned and scanning may not capture all details shown on the original official chart.
Unofficial nautical charts cannot be relied upon for voyage planning or position monitoring.
For a nautical chart to be considered adequate for navigational purposes, it must be:

  • officially issued,
  • the latest edition,
  • used in its original form,
  • maintained up to date using the latest available notices to mariners, and
  • of appropriate scale suitable for the navigational task at hand.

Australian official nautical charts

Australian official paper charts are issued and updated by the Australian Hydrographic Service (AHS) under the “Aus” series and provide bathymetric and near shore coverage of Australia’s area of charting responsibility.
The series is also largely reproduced by the United Kingdom Hydrographic Office as part of their world-wide “Admiralty” chart series.
AHS charts are easily identified by their “Aus” chart numbers and AHS crest above the chart’s title.
There is no other alternative numbering system for “Aus” charts.

The AHS distributes the full portfolio of “Aus” charts via AHS authorised chart agents, who sell and distribute “Aus” charts as “single” paper charts or grouped as “portfolios” of charts.
A list of authorised AHS chart distribution agents is available on the AHS website at: www.hydro.gov.au.

How to recognise unofficial nautical charts

To identify unofficial nautical charts, a comparison can be made with a genuine official AHS chart. The “look and feel” comparison may raise suspicions that a chart is unofficial.
An unofficial nautical chart may have:
  • ink of a different colour (and is not simply black and white);
  • inconsistent colour across the chart;
  • colours that can be erased; or
  • different paper weight or feel.
If it is suspected that an “Aus” chart is not genuine, contact should be made to AHS by email (hydro.sales@defence.gov.au) with relevant details.
In cooperation with AMSA, AHS will actively seek to stop the production and sale of unofficial copies of AHS products.

Recommendations

Ship owners, operators, agents and masters are advised to check and comply with their obligations regarding the carriage of official nautical charts.

AMSA reminds ship owners, operators, agents and masters that the carriage of up to date nautical charts is critical to safe navigation.
AMSA urges all purchasers, users, marine surveyors and recognized organizations to be vigilant in the identification and reporting of unofficial nautical charts.

Links :

Disappearing Tongan islet

The tiny offshore island of Monuafe in Tonga could be the kingdom's first island
 to disappear due to sea-level rising.

From Google Earth blog & Matangi Tonga online

The tiny offshore island of Monuafe has eroded and receded into the ocean.
It is now a submerged sand bar that appears briefly at low tide - the remnants of a forgotten island, with few knowing that it ever existed.

 Monuafe island with the Marine GeoGarage (NGA chart)

Twenty-five years ago, Monuafe was a healthy islet that supported a diverse flora of plant life.
It was one of many tiny islands that sat in the bay of Nuku’alofa and although the island was small (0.3 km square or half a rugby field) it supported 30 different species of plants including Pandanus and Hibiscus trees.
This flora and geography of the island was recorded in a 1990 survey issued by the National Museum of Natural History, Washington DC, USA (Ellison).


Today, the rapid erosion of the island can be viewed on Goodle Earth’s historical imagery, a graphic reminder of the rapid rate of change in our environment.

Monuafe December 2011, looking north. By Firitia Velt.

Local photographs of Monuafe Island in early 2002 show a drowning and badly eroded island with a small patch of flora.

 Monuafe 2010, looking north. By Firitia Velt.

The photographs taken by Firitia Velt in early 2012 show even more erosion, the island on the verge of going underwater with only a handful of dying plants left.
Photographs of the Island at the end of 2012 show the island completely submerged in water with only sand left that appears at low tide.

 Monuafe December 2011, looking north. By Firitia Velt.

Today in October 2014, we can see in the area that the sand is barely visible, even at low tide.

 Monuafe November 2012, looking north. By Firitia Velt.

Illegal sand mining and cyclones have been blamed for the swift erosion of Monuafe.
However, Monuafe could be Tonga’s first victim of sea-level rising, as other islands in the area such as Pangaimotu are known to be suffering from coastal erosion.

Links :
  • TheConversation : 15 years from now, our impact on regional sea level will be clear

Sunday, October 12, 2014