![]() ![]() Distance traveled varied across day and night for cargo ships, tugs, and ferries while speed varied between day and night only for ferries. We found that distance traveled and speed varied by season for tugs, motorized recreational and sailing vessels. 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. 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. We found that ferries traveled the greatest distance of any vessel type. 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 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. One such location is in San Francisco Bay where a variety of vessel types transit a highly developed urban estuary. Vessel traffic management systems can be employed for environmental management where vessel activity may be of concern. 4Department of Physics & Astronomy, San Francisco State University, San Francisco, CA, United States.3Department of Geography & Environment, San Francisco State University, San Francisco, CA, United States.2Estuary & Ocean Science Center, San Francisco State University, Tiburon, CA, United States.1ProtectedSeas, Anthropocene Institute, Palo Alto, CA, United States.Davis 3, Brendan Tougher 1 and Virgil Zetterlind 1 ![]() Samantha Cope 1,2*, Ellen Hines 2,3*, Roger Bland 2,4, Jerry D. ![]()
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