Free diver first to break 100m unassisted

On December 12, 2010, at 11:43am local time in the Bahamas,
New Zealander William Trubridge dove 100 meters into Dean's Blue Hole on Long Island
with a single breath of air and only his hands and feet to propel him down and up (no fins).

From TheGuardian / NZHerald

New Zealander William Trubridge this week became the first person to dive unassisted (without weights, fins or other aids) to a depth of 100m (328ft) on just one breath of air (held for 4 minutes, 10 seconds) only propelled by his arms and legs, diving down Dean's Blue Hole on Long Island in the Bahamas.

The famous French diver Jacques Mayol reached this depth in 1980 but used a weighted sled to descend and an inflated lift bag to return to the surface.

Trubridge broke the record on his second attempt of the day, after a bad start on his first try forced him to resurface.

"I entered the water and immediately started shivering. At the end of my breathe-up, as I turned to start the dive, some of the air in my lungs was forced into my mouth, and from there into my stomach. For a split-second I contemplated continuing, but it would have been foolhardy, so I aborted and rolled back onto the surface with a groan of dismay," he said.

Trying again after a short break, his body went into "autopilot" and he has few memories of the dive.

"I remember my depth alarm going off and pulling the tag from the bottom plate, 100 meters below the surface. I remember keeping my eyes half-closed and telling myself to 'relax' and 'flow' as I set off on the long swim back towards the light. And I remember erupting into celebration with my team the moment the judges displayed their white cards"

Freedriving is a dangerous sport and places intense pressure on the body.

"At 100 metres the pressure exerted by overhead water crushes [diver's] lungs to the size of small grapefruit, and the blood vessels inside them swell with blood in order to stop the lungs from imploding. The heart slows to 25 beats per minute, and [diver's] have to fight the narcotic effects of pressurised carbon dioxide and nitrogen - the so-called 'rapture of the deep' that tempts him towards a fateful sleep," said Joy Cottle from AIDA NZ, the body representing New Zealand freedivers.

Trubridge had already broken the record the day before, but was disqualified by the judges for breaching the rules.

"Yesterday I had already touched the mark and come back cleanly, but a technicality (not taking my noseclip off during the surface protocol at the end of the dive) meant that the dive was disqualified," he said.

It was Trubridge's 13th world-record.
He set his first record of 80 metres four years ago and since then has singlehandedly raised the world-record from 80 to 100 metres.

He dedicated today's dive to New Zealand's Hector's Dolphin, which is currently in danger of becoming extinct.

Trubridge, 30, grew up in Havelock North, but sailed the Atlantic, Caribbean and Pacific Ocean with his parents.
By age eight he was already diving to a depth of 15 metres.
Trubridge rediscovered free-diving when he was 22 and has spent hours a day underwater since then.

Here is a brief guide to "freediving":

▶ The pressure exerted by water at depths approaching 100m is so great that freedivers' lungs can be crushed to the size of a small grapefruit.

▶ Some freedivers use a special technique known as glosso- pharyngeal breathing to pack their lungs with more air as they plunge into the sea. Also known as "frog breathing", it involves using the vocal cords to force extra air into the lungs.

▶ Freediving dates back to at least 5400BC. Archaeological records from the period show Scandinavian hunters used a freediving technique to look for shellfish.

▶ While Trubridge was the first to dive to 100m without assistance, others have dived deeper with mechanical aids; Herbert Nitsch holds the record at 214m, which he achieved with the help of a weighted sled.

▶ The most unlikely freediving folk hero is Stathis Chatzi, who is feted for diving to a depth of 88m in 1913 to rescue a ship's anchor – despite suffering from emphysema.

Links :

• StuffNZ : Free-diver uses yoga to break world record
  
• YouTube : William Trubridge announcing "Project Hector" the 100 meter freediving world record attempt (training for Project Hector)
  
• YouTube : previous records 95m / 88m
• VerticalBlue
  

The oceans' SOS : conversation between Sylvia Earle and Jean-Michel Cousteau

Bob Evans of the Academy of Underwater Arts & Sciences brought together

ocean advocates Sylvia Earle and Jean-Michel Cousteau
to talk about the state of the ocean and what we can do to make a difference.
"The divers voice is an important voice " This conversation took place while the two were attending the Blue Ocean Film Festival in Monterrey, California August 2010.

From LosAngelesTimes

The planet's great communal resource provides protein sources and oxygen and is used for transportation, recreation and inspiration.
It's time to put it at the center of the climate change discussion.

The ocean is our global heat reservoir and one of two major carbon dioxide sinks.
If you agree that humans are trapping heat and carbon dioxide in the planet's atmosphere — and 53 years of rigorous observations at Scripps and other research institutions show that we are — then the ocean must be at the very center of the climate discussion. But it rarely is.

Consider Cancun: The negotiation text presented at the outset of the climate conference contained exactly one passing reference to the oceans, submerged in a Mariana Trench of footnotes.

Our stubborn addiction to burning coal, oil and natural gas is changing not only the composition of the atmosphere but the composition of the ocean as well.
The carbon dioxide those fuels pour into the air inexorably dissolves into the oceans, causing a process known as ocean acidification.
The oceans have absorbed 30% of the carbon dioxide that humans have ever produced, and they continue to absorb more each year.

This force-feeding has changed ocean chemistry.
As carbon dioxide is added to the ocean, it increases the amounts of dissolved hydrogen-carbonate ions and hydrogen ions (and hence acidity) but decreases the amount of carbonate ions.
By the end of the century, acidity will probably double from today's levels, unless we stop pouring carbon dioxide into the atmosphere.

The increasingly scarce carbonate ions are the very ones marine invertebrates combine with calcium ions to make their shells.
Ocean acidification has been likened to an accelerated case of osteoporosis that afflicts creatures such as massive coral reefs and pteropods — tiny snails that are a key food of commercially important fish.
There is also evidence that increasing acidity disrupts the juvenile development of a variety of marine organisms, including clownfish and krill.
Marine organisms are wonderfully suited to adapt to changes in seawater chemistry, but never before in history have they been asked to do this so quickly.

Marine scientists in various countries, including China, Germany and the United States, are engaged in a variety of national research programs focusing on the important biological impacts of ocean acidification.
We need to document which fisheries, coral reefs and marine ecosystems will be affected first, and how long they might take to recover (if at all).
That takes time, but don't be fooled by the pat response: "We need more research first."
We know enough to act now.

Links :

• HuffingtonPost : What will you do with your Blue marble ?
• Sylvia Earle Alliance
  
• Jean-Michel Cousteau's Ocean Futures Society

Tip of the day : Marine GeoGarage units

The Marine GeoGarage user has the choice to select his favorite system of units using 2 tools located at the bottom right corner of the main screen:

for the scale bar
clicking to change the scale bar units and switch between :
meters - nautical miles switch (scale : 750 m then next lower scale : 2 nm)
feet - nautical miles switch (scale : 5000 feet then next lower scale : 2 nm)
meters - kilometers switch (scale : 750 m then next lower scale : 2 km)
feet - miles switch (scale : 5000 feet then next lower scale : 2 miles)

Note : this setup doesn't affect the display of the global distance for a route
-always displayed in meters if D is less of 1852 meters and in nautical miles (nm) if D is greater than 1852 m-

for the Latitude / Longitude display of the cursor position (WGS84)
clicking to select the format on the dedicated icon and switch between :

Degrees & Decimal Minutes : DD°DD.DDD' (default setting for marine locations)

Degrees, Minutes, Seconds : DD°MM'SS.SS''

Decimal degrees : DD.DDDDDDD° (submeter precision, around 0.3 meter at higher Google Maps scale)

Monsoon: the Indian Ocean and the future of American power

Robert D. Kaplan, Monsoon: The Indian Ocean and the Future of American Power, New York:

Random House, 2010, ISBN: 978-1-4000-6746-6, 367 pp. $28.00

From UNC

Global geopolitical analysis had a rocky 20th century.
In the first decade of that century, the British geographer Halford Mackinder and the American naval strategist Alfred Thayer Mahan wrote brilliant and prescient essays about the structure of world politics and the fundamental factors, most notably geography, that shaped international relations.
Mahan's reputation suffered, however, from the revelation that Kaiser Wilhelm's Germany imbibed his writings during its quest to wrestle command of the seas from Great Britain; thereby, it was claimed, fueling a naval arms race that led to the cataclysm of the First World War.
Mackinder's reputation and geopolitical conceptions likewise suffered from their subsequent association in the 1920s and 1930s with the German school of Geopolitik which, it was claimed, provided the intellectual justification for Nazi expansion, thereby producing the even greater cataclysm of the Second World War.

World War II and the early Cold War period revived interest in geopolitics, but for many observers, strategists, and statesmen, the advent of nuclear weapons and intercontinental delivery systems rendered geopolitics irrelevant.
When events demonstrated that nuclear weapons did not mean the end of war or the struggle for power and hegemony, geopolitical analysis returned and scholars and strategists dared to "think the unthinkable," namely that a nuclear war could be fought and won.

Geopolitics suffered again in the 1960s and early 1970s, when Defense Secretary Robert McNamara and his successors surrendered U.S. nuclear superiority in deference to McNamara's theory of "mutually assured destruction" (MAD), the Vietnam debacle seemingly undermined the utility and morality of "power politics" on the international stage, and the pursuit of an imaginary detente with the Soviet Union fostered the impression that we no longer had an enemy to fear.

It took the loss of U.S. strategic superiority, a Soviet geopolitical offensive in the Third World, and the humiliating defeats suffered by the U.S. under the Carter administration (an administration that openly eschewed geopolitics in favor of "human rights") to bring about a resurgence in geopolitics in the late 1970s and 1980s.

The end of the Cold War, the collapse of the Soviet Empire, the pacification of Europe, and the globalization of technology and information once again called into question the relevance of geopolitics.
History, it was said, had ended. Geo-economics had replaced geopolitics.
As the 21st century approached, the writings of Mackinder, Mahan, Nicholas Spykman and lesser geo-politicians could safely be ignored.

Then, on a bright September morning in 2001, history reared its ugly head.
The United States was suddenly at war with an Islamic international terrorist organization headquartered in Southwest Asia, but with tentacles throughout the Islamic world and in many non-Islamic countries as well.
Furthermore, three longtime U.S. adversaries with ties to international terrorism, situated at both ends of the middle-belt of Asia--Iran, Iraq, and North Korea-- were actively seeking nuclear weapons.
Meanwhile, China and India were expanding economically and militarily, entering the ranks of rising global powers.

Geopolitics, then, is still relevant in the 21st century, but the focus of geopolitical analysis has shifted from Europe to Asia.
In his new book, Monsoon: The Indian Ocean and the Future of American Power, Robert D. Kaplan recognizes this shift and narrows the focus even more by identifying the Indian Ocean region as the geopolitical "pivot" of the 21st century.

The Indian Ocean region, Kaplan notes, is host to the "principal oil shipping lanes" and the "main choke points of world commerce," "accounts for one half of all the world's container traffic" and "70 percent of the petroleum products for the entire world."
Through the single Strait of Malacca flows half of the world's oil and a significant portion of the world's trade.
The region is also home, he notes, to "the entire arc of Islam, from the eastern fringe of the Sahara Desert to the Indonesian archipelago."
Furthermore, China and India, the two most populous countries in the world and the world's most important rising powers, inhabit the region.

Kaplan notes that the littoral of the Indian Ocean is divided geographically by the southern Arabian peninsula, the Strait of Hormuz (the entrance to and exit from the Persian Gulf), southern Afghanistan, and the Arabian Sea in the west; the subcontinent of southern India and the island of Sri Lanka in the center; and the Bay of Bengal, the west coasts of Burma and Thailand, and the Strait of Malacca in the east.
The strategically vital Strait of Malacca leads to the South China Sea and southern China and, ultimately, to the Pacific Ocean.

Since ancient times, Kaplan explains, the Indian Ocean hosted a "web of trade routes" thanks to the monsoon winds (hence the title of the book).
In the days of sailing ships, "[f]rom the Persian Gulf to Sumatra in the Indonesian archipelago," he writes, "it was a relatively quick seventy-day journey--twice the speed of sail travel in the Mediterranean, owing . . . to the monsoon."
Arab, Chinese, Malaysian, and African seafarers developed "commercial and cultural inter-linkages" across the region.

During the age of European exploration--what Mackinder called the "Columbian epoch"--the region, or at least parts of the region, fell under the sway of Portuguese, Dutch, and later British imperial power.
Kaplan also writes about the land-based Mughal Empire, which ruled India and adjacent territories in Central Asia from the 16th to the early 18th centuries, but his analysis highlights the enduring role of sea power for both economic and political advantage in the region.

It is here--with his discussion of sea power, China's maritime strategy, and the geopolitics of the region--that Kaplan, relying in part on the important works of Toshi Yoshihara and James Holmes of the U.S. Naval War College, sheds the most light on the importance of the Indian Ocean region to U.S. security.

Echoing the great Dutch-American geopolitical theorist, Nicholas Spykman, Kaplan calls this region the "maritime rimland of Eurasia." (Spykman, in The Geography of the Peace, famously stated that whoever controls the Eurasian rimland would control the destinies of the world).
Within the Eurasian maritime rimland, "Indonesia--in particular, the island of Sumatra--and peninsular Malaysia on the opposite side of the Strait of Malacca," Kaplan writes, "form the heart of maritime Asia."
The Strait of Malacca, he explains, is "the most vital choke point of world commerce."
It is there where "the shipping lanes of the Red Sea and the Sea of Japan converge," where "the spheres of naval influence of India and China meet," and where "the Indian Ocean joins the western Pacific."

The Indian Ocean region, as Kaplan notes, has been dominated by American sea power since the end of the Second World War.
In the 21st century, that important geopolitical circumstance is changing. China and India are reading Mahan and learning the strategic value of sea power.
Shanghai's ports handle more cargo than any other port in the world.
In five years, China will be the world's largest shipbuilder.
"America's unipolar moment in the world's oceans," warns Kaplan, "is starting to fade."

China's quest for naval power stems, in part, from its insatiable demand for energy.
Energy fuels its remarkable economic growth, and the source of that energy is Middle Eastern oil and natural gas which must transit the Indian Ocean and the Strait of Malacca to get to China's ports.
The "vital sea lines of communication around the southern Eurasian rimland," Kaplan explains, "must be protected."

China's ability to focus on sea power is due to the geopolitical fact that it is "more secure on land than it has been throughout history."
The end of the Cold War and the collapse of the Soviet Empire ended the most recent significant land threat to China's security.
It is an axiom of geopolitics that a power secure from serious challenges on land, can afford to take to the sea.

The Indian Ocean region is more hospitable to China's sea power than its Pacific coast.
Kaplan points out, as Spykman noted more than 60 years ago, that the geography of the western Pacific Ocean frustrates Chinese ambitions in that direction.
Several island chains, anchored by Taiwan, can effectively interfere with China's access to the Pacific.
China's ultimate goal, according to Kaplan, is to construct and develop a two-ocean navy.
"A one-ocean navy in the western Pacific," he writes, "makes China a regional power; a two-ocean navy in both the western Pacific and the Indian Ocean makes China a great power, able to project force around the whole navigable Eurasian rimland."

China does not need to replace the United States as the predominant global sea power to negatively affect U.S. security interests.
Instead, China need only develop the capability to deny U.S. access to key areas along the southern and eastern Eurasian rimland to effectively end U.S. naval predominance in this important region.
In the prophetic words of Nicholas Spykman, "Who controls the rimland rules Eurasia; who rules Eurasia controls the destinies of the world."

Links :

• USNL : China's navy, a turn to Corbett
• YouTube : The Indian Ocean and the Future of American Power with Robert Kaplan
  

iPhone/iPad & GPS

During the last Paris Boat Show in Paris, we got many questions relative to the iPhone and iPad GPS : main is does iPad have a real GPS ?

Indeed, it seems that Apple's first vague announcement wording and technical spec on its site have left people guessing about whether the iPad has a true GPS chip, and if so, on what models.

To sum up :

• Location data - The iPad only wifi gets location data ONLY from wifi routers (and external BT receivers if used). iPad with 3G will get location from GPS satellites, cell towers (assisted = A in A-GPS) and wifi.

1. The wifi only iPad does not have any GPS hardware in it. This is the reason GPS does not work on the wifi only iPad. Hence the technical reason.
2. The 3G iPad has GPS hardware built in. You do not need 3G service or contract to use the iPad GPS. GPS uses satellites to detect and track location, not 3G services. The A-GPS works to provide a faster initial location than using GPS alone. But the GPS works fine without A-GPS.

• Map data - In order to use the location data in a GeoGarage mobile app map, the map data must be first loaded in the cache memory to be used later with no internet/data connection. This is good for wifi only iPads with an external BT receiver and iPads with 3G (which have GPS) but no data connection. So to use a cache of the map data already downloaded for the area you are trying out, this requires that you pan around marine navigation zone on all the different zoom levels before turning off Wi-Fi.

So only the iPad 3G model has a GPS chip : (see iFixIt)
it is an AGPS chip - a true GPS chip that is assisted by cellular and WiFi signals, a Broadcom BCM4750 Assisted-GPS (A-GPS) chipset which is Broadcom’s first single-chip global positioning system (GPS) solution.
But that doesn't mean it's a low-quality GPS chip that needs help.

A-GPS actually provides superior speed and location (think indoors) capability.
The BCM4750 is tailored for mobile devices which have cellular connectivity for A-GPS to provide faster Time-To-First-Fix (TTFF) than when operating in standalone mode.
So A-GPS just adds faster time to fix from cold and warm startup.
Instead of waiting for the ephemeris/almanac data to come down over the GPS channel (there's some scheduling that dictates this), you just pull it over the Internet and supplant it.
If available, the cellular network also keeps pretty precise time (another thing which gets synced and takes a while on standalone GPSes), which speeds things up.
Lastly, because you know just about where you are (using Cell-IDs and WiFi triliteration through Skyhook -see coverage-/Google/Apple's list of MACs and GPS coordinates), you've already got a starting point for the optimization routine that is GPS.
All those things added up and you get a fix in under 10 seconds instead of minutes.

The AGPS chipset has massive parallel hardware correlators provide faster signal searches, accurate real-time navigation, improved tracking sensitivity and very low average power consumption.

Wi-Fi, Bluetooth, and GPS are all provided by Broadcom

and located beneath EMI shields on the front side of the board :
iPad 3G and iPhone 4 use the Broadcom BCM4750 receiver GPS

About Broadcom BCM4750IUB8 single-chip GPS receiver (sources iFixIt : 1 / 2 )"High-sensitivity, -157dBm assisted acquisition sensitivity (with coarse time assistance) and -162dBm tracking sensitivity, enabling indoor and deep urban operation"
It’s the low power consumption and the excellent tracking sensitivity of -162 dBm which no doubt convinced Apple to adopt the BCM4750 over the Infineon Hammerhead II used in the iPhone 3G and 3GS.
The chip consumes less than 15 mW while navigating with one second map updates which is ahead of other published competitive power consumption figures.

There is a preponderance of anecdotal evidence of this chips improved performance over the Hammerhead II. The published sensivity of the Hammerhead II is -160 dBm which doesn’t seem a lot but remember it is a logarithmic scale.
However, it’s important not to put too much weight on the random, unscientific testing available as they are generally under uncontrolled conditions and do not identify what mobile network assistance is provided.
The published steady state position accuracy of the BCM4750 is 2m.
The autonomous (no cellular network assistance) TTFF is market leading being as fast as 0.5s and providing a quick navigation start.
The excellent tracking sensitivity allows the BCM4750 equipped iPad to detect very weak signals including those partially blocked or reflected by buildings or other structures. (GPSTekReviews)

So Apple iPad purchasers can be confident that they have on-board an excellent GPS receiver to empower all the ever popular location based services and applications loaded on to their device.

 

Apple has integrated the UMTS, GSM, GPS, Wi-Fi, and Bluetooth antennas
into the stainless steel inner frame.

How to determine the accuracy and quality of the GPS signal ?

The GPS signals come down from the visible satellites and the receiver makes its mathematical determination about where is the location (see 'How the GPS works')
To determine the accuracy, the best way to do it is to log NMEA data for several hours with a position each second and then look at the scatter plot with dedicated software (SA Watch or GPSInfo).
The problem with the iPhone/iPad is that there is no way to do that currently, not even to log just the position every second because the programing library doesn't give the access to this data.
The iOS location API only provides "high level location data" : position (Lat/Lon/Alt/Pitch), fix quality, heading and speed but the number of satellites used, signal strength, accuracy data (HDOP or GDOP) are not available.
By the way, accuracy is also influenced by the number of GPS fixes per second delivered by the sensor : the iPhone 3G‘s update rate is typically around 1.5Hz but can reach values up to 2Hz (comparing to basic 1 Hz marine GPS).

iPhone 3GS/4 needs no 3G service to obtain a GPS position fix.
But it also appears that the various bug fix updates to the firmware are having a significant impact, both good and bad, on GPS accuracy.
Users have experimented some problems with GPS reception on iOS 3 and iOS4 as well (see Apple support discussions / Apple discussions), with lots of drop outs, making navigation on iPhone 3GS impossible.
In July, Apple silently booted Skyhook and Google from providing GPS data on iOS3.2 and later, creating their own GPS service instead.

How to add an external kit to plug another GPS ?

It's not possible to connect standard Bluetooth-enabled GPS to an iPhone.
Although iPhone has Bluetooth, the firmware denies access to Bluetooth GPS devices that are not specifically designed to work with iPhone.

• TomTom kit : for iPhone 3G/3GS/4 (GPSPassion)
• Bad Elf GPS : Tiny dock-dongle adds GPS to iPad, iPod Touch (Wired)
• Magellan ToughCase : for iPod Touch, iPhone 3G & 3GS -incompatible with iPhone 4- , the first case with both an integrated GPS chip (SiRFstarIII) and an integrated battery (1840mAh, compared to the 4's 1420mAh, 3Gs's 1219mAh 3G's 1150mAh)
• Dual XGPS300 / XGPS251 Cradle for iPod Touch (Wired) / Dual XPGS150

With jailbroken devices, some applications allow users to add a Bluetooth GPS receiver on iPod Touch, iPhone and iPad. See :

• Rogy BT
• BTstack
• Orange Gadgets iGPS360

Note : we do not support jailbroken installations and cannot give any guaranties on proper operation regarding all these devices listed for informational purposes only.

Is it possible to connect an external GPS ?

For the moment Apple has not open up their Bluetooth profile to allow to receive NMEA data from a Bluetooth GPS. (Tekzilla video)
So the other option is to send out raw NMEA-0183 data over TCP/IP via a Wireless Serial Server (a specific article will be written on the subject next) :

• PosiMotion G-Fi : mobile network and GPS router for iPhone, 3G/3GS and iPad Wifi/3G, boadcasting NMEA sentences over udp Multicast
• MaxQData Quantum : modules for iPod Touch and iPhone using WiFi
• Gomite LocoGPS WiFi mobile navigation server
• GNS 5870 MFI

Note : in case of NMEA 2000 output, it's possible to convert the N2k data to NMEA0183 before broascasting over WiFi via some converter :

• Actisense NGT-1
• Maretron USB100
• Airmar U200 UBS gateway

Using your favorite Marine GeoGarage iPhone/iPad application, you can preload a geographical area’s worth of nautical maps while you have a WiFi or 3G connection by scrolling around the map to cover your region of interest.
Then, when WiFi is out of range, and 3G is turned off to avoid roaming fees, Marine GeoGarage app shows it's an useful tool for using nautical charts directly with the embedded ihone/iPad GPS.
But don't forget to consider that our mobile application is not to be used as a primary mean for navigation.Links :

• Evaluation of High Sensitivity GPS Receivers : School of Surveying and Spatial Information System, UNSW, Australia
• IOS version history 
• iPad : How to find the serial number, UDID, IMEI, ICCID, and Cellular Data Number
• iOS 5 : Understanding Location Services 
• MacWorld :  How the iPhone knows where you are