Hi Cyril, this depends on the context and situation. Any short or long term changes to water levels can alter the accuracy of shipping maps and may alter routes; storm frequency/intensities and hazards in general can have impacts as well. Cheers -A
Sinking and submerging has been the most common cause of ships being written off, accounting for 49 of the 75 losses in 2014. Other significant causes include ships being wrecked or stranded (13 losses) and four fires or explosions. Over a third of losses come from two Asian maritime regions. The seas round South China, IndoChina, Indonesia & the Philippines accounted for 17 losses while those surrounding Japan, Korea and North China had 12.
Over-reliance on electronic navigation is also a rising safety concern. Lessons learned from accident reports related to key technologies such as Electronic Chart Display and Information System are not always being filtered back into the training environment. Dependence on e-navigation, the inter-connectivity of the maritime sector, the current low levels of cyber security awareness and – longer term – the prospect of unmanned ships, means ships and ports have become enticing targets for hackers. A cyber-attack can result in a total loss, leading to substantial insurance claims for hull, cargo and protection & indemnity underwriters. It may even involve multiple vessels from the same company. Companies must simulate potential scenarios and identify appropriate mitigation strategies.
This is where Andrew Tam's alteration in the accuracy of shipping maps and alteration in routes comes in. Storm frequency/intensities and extreme events, possibly (?) related to climate change can induce hazards leading to loss of ships.
While still on the subject of cyber crime, one is reminded of the following: On April 28, 1997, then US Secretary of Defense William S. Cohen gave an important keynote address at the Conference on Terrorism, Weapons of Mass Destruction, and US Strategy at the University of Georgia in Athens. When asked a question about terrorism, Cohen had this to say as part of his response about the type of technology that existed, even back then:
"Others are engaging even in an eco-type terrorism whereby they can alter the climate, set off earthquakes, volcanoes remotely through the use of electromagnetic waves" (http://www.defense.gov/transcripts/transcrip...).
This admission counters the claims made by some that no such technology exists, and that it is impossible to create seismic activity using directed energy. Clearly the technology has been around for a while, and the notion of it being used as a weapon is anything but a baseless conspiracy theory.
Then, there is the EU report on the environment, security and foreign policy, that was released on January 14, 1999 (http://www.europarl.europa.eu/sides/getDoc.d...). This report outlines various types of weapon threats, including a section entitled, "HAARP - a weapons system which disrupts the climate."
"HAARP can be used for many purposes. Enormous quantities of energy can be controlled by manipulating the electrical characteristics of the atmosphere. If used as a military weapon this can have a devastating impact on an enemy. HAARP can deliver millions of times more energy to a given area than any other conventional transmitter. The energy can also be aimed at a moving target which should constitute a potential anti-missile system."
Later references to HAARP describe it as "a matter of global concern," emphasizing that most people have no idea it even exists. This was written, of course, more than 2 decade ago -- and yet not much has changed since that time, despite several pushes to make HAARP more transparent. But if HAARP is truly responsible for helping to induce some of the seemingly natural disasters that occur in the world, it is no surprise that the program continues to be kept largely under wraps."
You can view the HAARP Fluxgate Magnetometer for yourself at the following link: http://maestro.haarp.alaska.edu/cgi-bin/scma... Mirza Arshad Ali Beg
In the forties and fifties there were reports of air planes and ships disappearing with little or no traces in the Bermuda triangle. At that time, the concept of climate change and global warming had not been conceived.