Saturday, October 26, 2013

Dolphins use blue whale to surf !

Whale watching passengers and crew aboard Captain Dave's Dolphin and Whale Watching Safari
off Dana Point, California saw something even rarer than a blue whale.
"The crew caught on tape an amazing interspecies encounter of a small pod of bottlenose dolphins catching a ride, actually surfing, on the front of a giant blue whale," said Captain Dave Anderson.
"This kind of a free ride is possible for these dolphins by positioning themselves in front of this rare and endangered whale and riding the pressure wave created by the force of this giant moving through the water."

From Treehugger

The ocean might seem solely a perilous place, where countless marine creatures are endlessly fighting for survival in the dark depths.
But as it turns out, for our seagoing mammalian counterparts at least, life among the waves isn't harsh enough to keep from having a good time.

Recently, Dolphin Safari tour operator Captain Dave Anderson and his crew filmed a remarkable sight off the coast of Dana Point, California -- a pod of wild bottlenose dolphins engaged in a bit of playtime with a massive blue whale.

 Dana Point, California
>>> geolocalization with the Marine GeoGarage <<<

It may be a little hard to see in the video, but Anderson tells the Dana Point Patch that the dolphins appeared to be, in effect, 'surfing' on the wave generated by the 80-foot whale swimming along the surface of the water.

"This type of surfing behavior is usually seen when dolphins ride the pressure wave created in front of a boat. However, this time the dolphins were having fun and “surfing” the largest animal in the world, a blue whale," says Anderson, noting that such interspecies interaction -- particularly for amusement is extremely rare.
"Even though blue whales and bottlenose dolphins coexist in some of the same oceans, they do not run in the same social circles and are not typically seen together, making this a unique and memorable whale watching encounter for all."

Interestingly, this isn't the first time that dolphins and whales have been caught horsing around together in the wild.
On a least two separate occasions, dolphins were been observed playing with humpbacks whales in a slip-and-slide sort of game they appear to have invented.


Many species interact in the wild, most often as predator and prey.
But recent encounters between humpback whales and bottlenose dolphins reveal a playful side to interspecies interaction.
In two different locations in Hawaii, scientists watched as dolphins "rode" the heads of whales: the whales lifted the dolphins up and out of the water, and then the dolphins slid back down.
The two species seemed to cooperate in the activity, and neither displayed signs of aggression or distress.
Whales and dolphins in Hawaiian waters often interact, but playful social activity such as this is extremely rare between species.

It is less clear in this recent incident if the blue whale was a happy participant, or merely trying to move on its way -- but a playful encounter with dolphins seems an opportunity worth relishing.

Friday, October 25, 2013

The making of a mysterious Renaissance map

The Carta Marina, made in 1516, relied on detailed knowledge from nautical charts and books.
Martin Waldseemüller's 1516 Carta Marina sought to present the most up–to–date conception of the world at that time.
Equal in size to his 1507 map, the Carta Marina is markedly superior to the earlier map in artistic detail,
possibly reflecting the hand of the artist Albrecht Dürer (1471–1528).
It incorporates greatly expanded and corrected geographical information.
The Carta Marina could be considered the first printed nautical map of the entire world. 
However, in part because of the controversies surrounding his earlier naming of the Western Hemisphere “America,” Waldseemüller omits the word from the Carta Marina, and indicates that North America is joined with Asia.
Credit: Courtesy of the Library of Congress and the Jay I Kislak Foundation.

From LiveScience (by Tanya Lewis)

Not much is known about how Renaissance cartographer Martin Waldseemüller created his 1516 "Carta marina" world map, possibly the most up-to-date conception of the world at the time.

But scholar Chet Van Duzer offered a rare peek into Waldseemüller's process Tuesday night (Oct. 22) during a talk here at the New York Public Library.
"A careful analysis of his sources allows us to go inside his workshop in Saint-Dié [in France] and essentially watch him at work as he made the Carta marina," Van Duzer, who is based at the Library of Congress, said in his talk.
[See Photos of the Mysterious Carta Marina Map]

Van Duzer and his colleague John Hessler recently published a book on Waldseemüller's works entitled "Seeing the World Anew: The Radical Vision of Martin Waldseemüller's 1507 & 1516 World Maps," (Levenger Press, 2012).

 Atlantic Ocean and surrounding lands, from Waldseemüller's edition of Ptolemy, published in 1513.
Note the name of the land mass on the left.
What famous name has been removed from this map?

Waldseemüller is best known for his 1507 world map, the first to call the New World "America."
The cartographer began his career, Van Duzer said, by basing his maps on those of the Alexandrine geographer Claudius Ptolemy from the second century A.D.
These maps were based on geographic descriptions in books, rather than direct maritime knowledge.

Martin Waldseemüller's Carta marina of 1516 has always remained in the shadow of his 1507 map--less famous and less studied.
In fact the Carta marina is in several ways more interesting than the 1507 map: it is the result of Waldseemüller's radical re-evaluation of what a world map should be.
Waldseemüller essentially started from scratch in creating the Carta marina, rejecting the Ptolemaic model and other sources he had used in creating the 1507 map, and adding more descriptive text and a rich program of illustration.
In this talk Van Duzer examines the differences between the two maps and discuss the new sources that Waldseemüller used, placing particular emphasis on his iconographical sources.

But in making the Carta marina, printed just nine years later, Waldseemüller abandoned his older sources in favor of contemporary nautical charts, maps of maritime regions and coastlines that seafaring explorers of the time would have used.
"When he came to create his new monumental world map, the Carta marina, Waldseemüller made a choice between these two competing cartographic systems, the Ptolemaic tradition and the nautical chart tradition," Van Duzer said — "and he based his map on nautical charts."

Waldseemüller based the Carta marina's coastlines on a nautical chart made by Nicolo de Caverio of Genoa in about 1503.
The two maps have similar coastal place names and layouts.
For example, the shapes of Greenland, the eastern coast of South America and Africa are nearly identical.

One major difference is that the Carta marina omits a large part of northeast Asia and Japan — probably because these regions were relatively unknown to European explorers, Van Duzer said.
Unlike the Caverio map, Waldseemüller's map is crowded with descriptive texts and illustrations of royal rulers.

The Carta marina depicts King Manuel of Portugal riding a sea monster near the southern tip of Africa, symbolizing Portugal's control of the sea route between Africa and India.
The image was most likely inspired by an image of Neptune riding a sea monster in Italian printmaker Jacopo de’ Barbari’s print of Venice, Van Duzer said.

The map also includes an image of Noah's Ark resting in the mountains of Armenia, probably based on similar images in other nautical charts of the time, Van Duzer said.

The Carta marina depicts India as a land of animalistic people and barbarism.
For instance, there's an image of "suttee," the Hindu practice of a widow burning herself to death on the funeral pyre of her husband.
Other less well-known areas, such as America, contain images of cannibalism.

Carta Marina: the title continues with the explanation:
"A Portuguese Navigational Sea-chart of the known Earth and Oceans."
As stated by Peter Whitfield "This map is in fact the first and only printed version of the world charts previously known only to Spanish and Portuguese explorers and their patrons" (Whitfield 1994, 54-55). Waldseemüller’s debt to the Cantino map is clear in his 1516 map.
Two years after publishing the great "Carta Marina" Waldseemüller died, leaving a legacy of maps and a book, and the name "America" on maps.
 -page of the book showing Florida (see with zoom)

Despite these seemingly outdated images, the Carta marina still represents a leap forward in cartography, because Waldseemüller relied on much more updated sources than he did for his earlier 1507 map.
In addition to nautical charts, Van Duzer's analysis reveals, the Renaissance cartographer relied on books written by recent explorers.
"The Carta marina is Waldseemüller’s most original creation," Van Duzer said.
"He began his cartographic career by redrawing Ptolemy, but ended it by creating something entirely new, a mosaic image of the world with each stone of his own careful choosing."

Links :
  • LOC : Compare 1507 map and Carta Marina 1516
  • MapHist : Legends on Martin Waldseemüller's Carta Marina of 1516, with comments from Joaquim Alves Gaspar, CIUHCT, University of Lisboni)
    1/ The Carta Marina is indeed very similar to the Caverio planisphere (1505) and was most probably based on it. But the Caverio itself is copied from the Cantino planisphere (1502) and from other unknown Portuguese sources of the time.
    2) The only signs that Columbus conception of the world was adopted are in the legends, not in the geometry of the chart, which is identical to Cantino's. In the Cantino, the separation between Asia and America seems clear: there is a legend near the eastern margin reading "Oceanus occideroriêntalis" which probably means "an ocean eastward of China and westward of America";
    3) If the geometry of the chart is identical to Cantino's, which was based on latitudes, magnetic courses and estimated distances, why the square mesh? Apparently Waldseemuller was also convinced (like many others) that this was a "square chart". It is interesting to notice that this kind of explicit mistake (i.e., the square grid) is not shown in any pre-Mercator chart of Portuguese (and Spanish, I presume) origin.
  • GeoGarage blog :  Worlds upon worlds : about the Waldseemüller world map (1507) / A world redrawn : when America showed up on a map, it was the universe that got transformed
  • Google's Michael Jones-need Apollo mission for the Ocean

Thursday, October 24, 2013

UK & misc. update in the Marine GeoGarage

Today 954 charts (1825 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

635 charts for UK
(3662 Aden Oil Harbour & 3722 Approaches to Muhammad Qol
withdrawn  from previous update  
434 Balhaf Terminal and Little Aden Oli Harbour
added  from previous update  )

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


124 charts for Spain & Portugal :

  • 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 Approache
  • 690 Cabo Delgado to Mikindani Bay
  • 886 Estrecho de la Bocayna and Approaches to Arrecife
  • 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 Nisis Venetico to Nisos Spetsai including the Channels between Akra Maleas and Kriti
  • 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 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
  • 1869 Gran Canaria to Hierro
  • 1870 Lanzarote to Gran Canaria
  • 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
  • 3448 Plans in Angola
  • 3578 Eastern Approaches to the Strait of Gibraltar
  • 3633 Islas Sisargas to Montedor
  • 3634 Montedor to Cabo Mondego
  • 3635 Cabo Mondego to Cabo Espichel
  • 3636 Cabo Espichel to Cabo de Sao Vicente
  • 3764 Cabo Torinana to Punta Carreiro
  • 4114 Arquipelago dos Acores to Flemish Cap
  • 4115 Arquipelago dos Acores to the Arquipelago de Cabo Verde
  • Ilha de Madeira, Ponta Gorda de Sao Lourenco including the Port of Funchal


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


49 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
  • 2086 East London to Port S Johns
  • 2087 Port St John's to Durban
  • 2088 Durban to Cape Vidal
  • 2095 Cape St Blaize to Port S. John's
  • 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
  • 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

    57 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
    • 766 Ellice Islands
    • 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
    • 2006 West Indies, Virgin Islands, Anegada to Saint Thomas
    • 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


    So today, for a cost of 9.9 € / month ('Premium Charts' subscription), you can have access to 2588 additional updated charts (4332 including sub-charts) coming from 3 international Hydrographic Services (UKHO, CHS, AHS and France).

Three new crowdsourced XPRIZES launched for ocean health


The Wendy Schmidt Ocean Health XPRIZE is a global competition that challenges teams of engineers, scientists and innovators from all over the world to create pH sensor technology that will affordably, accurately and efficiently measure ocean chemistry from its shallowest waters... to its deepest depths.
These break-through sensors are urgently needed for scientists, managers and industry to turn the tide on ocean acidification and begin healing our oceans.

From National Geographic

On October 22, the XPRIZE launched an Ocean Initiative, which aims to give three new global prizes to teams that develop technologies by 2020 that protect ocean health.

In September, the nonprofit group had launched the $2 Million Wendy Schmidt Ocean Health XPRIZE, which challenges teams to create affordable pH sensor technology that will help scientists measure ocean acidification.


The XPRIZE was founded in 1995 as a nonprofit prize program (formerly called the X Prize Foundation) to spur innovation around pressing global problems.
Past XPRIZE efforts have focused on private efforts in suborbital commercial spaceflight, efficient cars, and moon rovers.
In 2004, Burt Rutan’s SpaceShipOne was awarded the $10 million Ansari X-Prize for spaceflight for soaring more than 100 kilometers (62 miles).

National Geographic spoke with Paul Bunje, senior director for oceans at XPRIZE.

What will the new ocean prizes specifically address?

I wish I could tell you but that’s the exciting part about what we’re doing here.
We believe that if we’re going to live by our mantra that anyone can solve a grand challenge, then anyone can also help us identify what the challenge should be.
So we’re opening up the XPRIZE program, and asking the public to help us identify what those next three prizes should be.
It’s a little bit scary as you might imagine.
We know the issues facing the oceans, with pollution, overfishing, acidification, and so on.
But it would be folly for us not to involve as much of the globe as possible in figuring out the solutions.

How will the process work?

[On October 22] we announce three more ocean XPRIZES, making five total over 10 years.
[The Wendy Schmidt Oil Cleanup XCHALLENGE had granted $1.4 million in 2011 for efforts to improve remediation technologies.]
Anyone can submit their idea for the new prizes, but that’s not really sufficient for identifying a grand challenge.
Through our Ocean Ambassador program we want people to join us.
When they sign up they will go through learning, and connect with experts like Sylvia Earle.
We want Ocean Ambassadors who will really commit and join us in the ideation process.
It’s more involved than just tossing up a quick idea on Facebook, we want people who are really going to put some work into this.

Any idea how many Ocean Ambassadors you are looking for?

We’re looking for thousands, maybe hundreds of thousands.
I’d be over the moon if we had 10,000 people who were working a few hours a month on this.

Some conventional wisdom says it’s difficult to get people to contribute a significant amount of work for free.
People are keen to submit a photo or take another quick action, but ask them for something more involved and you tend to get a much lower response rate.
Are you concerned about that?

We’re trying to design the program so it’s like a funnel: in the first instance lots of people will want to give us ideas and maybe some will follow those ideas.
Over time we’ll bring people closer and closer into the funnel, so a smaller and smaller group will become very active.
It’s not enough to simply submit an idea and have people vote on them because there’s a lot more that goes into it for an XPRIZE.
The important thing for us is there are people out there with great ideas that we don’t know of, who are outside the established system of university professors, explorers in residence, and so on.
What we need to figure out is launching the program and letting it be designed by the crowd.

 The Wendy Schmidt Ocean Health XPrize aims at combating ocean acidification

Are the new ocean XPRIZES also supported by Wendy Schmidt [who is president of the Schmidt Family Foundation and is married to Google chair Eric Schmidt]?

Wendy has graciously helped seed our ocean initiative but it is intended to grow with other philanthropists and individual donors.
We’ll have to identify new sponsors.

You have said this is the most ambitious XPRIZE program to date, suggesting it tops the race of private efforts to space supported by the Ansari XPRIZE in 2004. Why?

The oceans are completely underexplored and underfinanced.
We don’t want to give up on space, clearly, but there has been a real abdication in funding ocean exploration by governments, it’s fleetingly small now and getting smaller.
So what the XPRIZE recognizes is that we just haven’t explored them.
It’s our belief that discovery creates great things.
The other side of it is the oceans are the lungs of our planet, so it’s planetary health we’re talking about.
If we’re not willing to address what is happening in our oceans then it’s putting humanity at risk.
The XPRIZEs are about radical breakthroughs for the betterment of humanity.
They will have exponential impact on industries and protect our oceans, so if we want to better humanity there’s no better place to start.

Links :
  • Xprize : press release
  • The Guardian : XPRIZE dives into Earth's final frontier – our oceans and their future health

Wednesday, October 23, 2013

The iPhone’s positioning sensors were never good

Six iPhones tested, and they can't agree on magnetic north

From Tidbits


Much is being made of Gizmodo’s tests showing that the positioning sensors in the iPhone 5s are off. Not just a little off, but off in a non-trivial way.
The gyroscope read 3 degrees off, the compass 8 to 10 degrees off, and even the accelerometer seemed to be inaccurate.

The iPhone 5s may have a motion sensor/compass problem.
ZolloTech puts the iPhone 5s to the test against the iPhone 5, and iPhone 5c, then starts by opening the app
and then calibrating all of the iPhone compass apps.
(recorded using Google Glass)

There was only one problem with Gizmodo’s experiment: they only compared the iPhone 5s against the previous iPhone 5.
That may have seemed reasonable at the time, but it assumes that the iPhone 5’s positioning sensors were accurate.
Testing by TechHive in a variety of locations with an iPhone 4S, 5, 5c, and 5s now shows that the iPhone’s positioning sensors have never been any good.

 When comparing the measurements against an actual compass, neither iPhone's compass points to the same magnetic north as the real tool; however, the iPhone 5 clearly has a more accurate measurement.
 You probably shouldn't be using an iPhone compass to set your course at sea anyway
—but, yeah, don't do that.

While TechHive didn’t find anything wrong with the iPhone’s leveling capabilities, none of the iPhone compasses matched up — to themselves, to each other, or to an inexpensive Suunto A-10 recreation compass.
Some were off as much as 20 degrees, and the worst deviation came in three different iPhone 5 units.
TechHive also tested the compass of the Android-powered LG G2 smartphone and found that it was the closest to the Suunto, off by only 3 to 4 degrees.
(The question this result raises is if the Suunto was itself accurate; a single cheap magnetic compass might not have been the best control.)

While Apple could, and should, make the iPhone positioning sensors more accurate and consistent, the moral of the story is to not rely on smartphone sensors for critical tasks.
As our own Rich Mogull said during our staff discussion, “As a mountain rescue guy, digital compasses make me nervous. I have enough trouble keeping a physical compass calibrated and accurate. You walk out of an office building in a city near power lines, and no compass will be accurate. It’s just physics. Indoors? Not a chance.”

It’s also worth noting that despite the fuss surrounding this story, we’re not hearing from users about losing an orienteering race due to incorrect compass readings (iPhones wouldn’t be allowed anyway), having a woodworking project be tippy because of issues with the iPhone’s level, or even having trouble playing accelerometer-based games.
In short, despite the proven problems, the iPhone’s positioning sensors still work sufficiently well for the uses that most people demand of them.

Links :