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Mystery of the cargo ships that sink when their cargo suddenly liquefies.

Vessel traffic management systems can be employed for environmental management where vessel activity may be of concern. One such location is in San Francisco Bay where a variety of vessel types transit a highly developed urban estuary. We analyzed vessel presence and speed across space and time using vessel data from the Marine Monitor, a vessel tracking system that integrates data from the Automatic Identification System and a marine-radar sensor linked to a high-definition camera. In doing so, we provide data that can inform collision risk to cetaceans who show an increased presence in the Bay and evaluation of the value in incorporating data from multiple sources when observing vessel traffic. We found that ferries traveled the greatest distance of any vessel type. Ferries and other commercial vessels (e.g., cargo and tanker ships and tug boats) traveled consistently in distinct paths while recreational traffic (e.g., motorized recreational craft and sailing vessels) was more dispersed. Large shipping vessels often traveled at speeds greater than 10 kn when transiting the study area, and ferries traveled at speeds greater than 30 kn. We found that distance traveled and speed varied by season for tugs, motorized recreational and sailing vessels. Distance traveled varied across day and night for cargo ships, tugs, and ferries while speed varied between day and night only for ferries. Between weekdays and weekends, distance traveled varied for cargo ships, ferries, and sailing vessels, while speed varied for ferries, motorized recreational craft, and sailing vessels. Radar-detected vessel traffic accounted for 33.9% of the total track distance observed, highlighting the need to include data from multiple vessel tracking systems to fully assess and manage vessel traffic in a densely populated urban estuary.

Bulk Carrier and Cargo Ship Collide in the Straits of Singapore.

Cargo Ship Saigon Queen Sinks Off Sri Lanka, 4 Crew Missing.

Vietnamese Boat Collides with Hong Kong Cargo.

Vietnamese Boat Collides with Hong Kong Cargo.

Somali pirates hijack Iran cargo ship in Maldives.

American cargo ship captain detained at Venezuela port.

Cargo ship damaged after collision off Istanbul.

Fire Extinguished on Cargo Ship off Norway.

Cargo Ship Makes 1st-Ever Solo Trip Through Northwest Passage.

Cargo ship from Nunavik mine to travel Northwest Passage.

Un cargo transportant 60.000 tonnes de charbon coule au large de Bombay.

Ship, cargo piracy on the rise: Aon.

Wreck of Cemfjord cargo ship found.

Wreck of Cemfjord cargo ship found.

USNS Richard E. Byrd (T-AKE-4), a LEWIS and CLARK-class dry cargo ship, rescued nine crew members from a Yemeni-flagged cargo vessel that had lost power, was taking on water and was adrift in the Gulf of Oman July 28. Richard E. Byrd is currently on a scheduled deployment to the U.S. 5th Fleet area of responsibility conducting maritime security operations and theater security cooperation efforts.

Indian Coast Guard interdicts Russian cargo vessel trying to escape.

Indian Coast Guard interdicts Russian cargo vessel trying to escape.

Chinese Cargo Ship Sinks, 12 Crew Rescued.

Four dead after cargo ship sinks in North Sea.

Pirates attack British cargo ship in Gulf of Guinea.

Pirates shift tactics to target crews, not cargo.