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Vessel Traffic in the Aleutians. Review of AIS Data from Scotch Cap. Scotch Cap, Unimak Pass before the April 1, 1946 tsunami. Remains of lighthouse after April 1, 1946 tsunami. AIS Data October 2005 through June 2006. Provided by Marine Exchange of Alaska. Observation #1.

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ais data october 2005 through june 2006
AIS Data October 2005 through June 2006

Provided by Marine Exchange of Alaska

observation 1
Observation #1

Unimak Pass transits are under-reported due to timing of data query.

observation 2
Observation #2

Eastbound Unimak Pass Great Circle traffic is only a fraction of Westbound traffic

observation 3
Observation #3

About 17% of Unimak Pass Great Circle traffic originates from California.

Our original analysis did pick up on this.

local traffic includes
Local Traffic Includes
  • ADF&G Enforcement
  • Aleutian Trade Act Freighters
  • Container Ships
  • Fishing Vessels (400)
  • Ocean Research
  • Product Tanker (1)
  • Reefer Cargo
  • Towing Vessels
large vessels calling at aleutian ports
Large Vessels Calling at Aleutian Ports
  • 70 container ship calls with a typical fuel capacity of 1.8 million gallons of persistent
  • 200 reefer/tramper ships port calls with a typical fuel capacity of 300,000 gallons
  • AIS Scotch Cap data reports about 900 Unimak Pass transits by ‘local traffic’; over 700 of which were fishing vessels
weather
Weather
  • Could be better
  • Prevailing winds in the islands blow from the south and the west
  • The Aleutians Sub-area Plan provides current diagrams
foreign vessel casualties 1991 2004
Foreign Vessel Casualties(1991-2004)
  • Forty-five (45) foreign vessel casualties
  • These reports to the Coast Guard included 16 loss of maneuverability incidents.
  • We believe that foreign vessel casualties are probably under reported;
us vessel casualties 1990 2005
US Vessel Casualties(1990-2005)
  • 413 casualties effecting seaworthiness reported to USCG
  • Vessels usually smaller than foreign vessel incidents, mostly fishing vessels