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Metadata
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ID
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A-1-90-WO
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Abstract
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United States Geological Survey, Menlo Park, California.
Chief Scientists: Ed Clifton, Rick Starr. Geological data
(beamtrawl, crabpot, Smith-MacIntyregrab, bubblepulser,
sidescansonar, GPS, rangerange, magnetics,
integratednavigation, LoranC, RhoRho, vibralift,
vibratingcore, ottertrawl) of field activity A-1-90-WO in
Gold Beach-Cape Blanco, Oregon from 09/21/1990 to 10/03/1990
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Organization
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United States Geological Survey, Menlo Park, California
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Project/Theme
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Placer Minerals Study
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Chief Scientist
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Ed Clifton
Rick Starr
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Activity Type
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Geological
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Platform
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Aloha
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Area of Operation
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Gold Beach-Cape Blanco, Oregon
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Location map
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Bounding Coordinates
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43.47939
-124.67551 -124.21142
42.22996
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Ports
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leave Coos Bay, OR
arrive Coos Bay, OR
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Dates
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09/21/1990 (JD 264) to 10/03/1990 (JD 276)
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Analog Materials
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list
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Index map
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Crew
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Bob O'Brien
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Biologist, PSU
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Bob Shermer
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Ship Captain
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Bob Woolsey
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Geologist, Univ of Miss.
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Cheryl Mardock
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Geologist, USBM
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Curt Peterson
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Geophysicist, PSU
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Dave Fox
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Biologist, ODFW
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Dave Hogg
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Electronics Technician, USGS Western Region
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Ed Clifton
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Chief Scientist, USGS Western Region
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Gerry Connard
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Geologist, NW Geo.
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Graig McHendrie
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Navigator, USGS Western Region
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Greg McMurray
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Biologist, DOGAMI
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Joe Fisher
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Biologist, OSU
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Jose Garcesto
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Chief Mate
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Mike Hamer
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Navigator, USGS Western Region
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Monty Simmons
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Geologist, Univ of Miss
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Nestor Verdugo
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Chief Engineer
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Rick Starr
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Chief Scientist, ODFW
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Rusty Tarver
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Geologist, Univ of Miss
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Walter O'Niell
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Geologist, Univ of Miss
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Equipment Used
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beamtrawl
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crabpot
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Smith-MacIntyregrab
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bubblepulser
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sidescansonar
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GPS
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rangerange
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magnetics
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integratednavigation
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LoranC
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RhoRho
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vibralift
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vibratingcore
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ottertrawl
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Notes
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The navigational system used on the R/V ALOHA cruise, A1-90-WO, was an
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IBM 386 PC based system using inputs from an ASHTECH (MODEL #) gps receiving
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unit and a DECCA 540 delnorte transponder ranging system. Delnorte was used for
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the majority of the cruise because of its higher degree of positioning accuracy
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being replaced by gps only when the ship was out of range of the land based
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transponder stations or in areas of poor station geometry, i.e. along baselines
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between stations. The positioning accuracy of the delnorte system is about ____
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when three or more of the stations are being used for the ranging calculations,
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and that of gps about ___________, but can be up to 100 meters when selective
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availability (errors introduced into the gps signal by the defense department)
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is implemented. Both systems calculate ranges by using electromagnetic signals.
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The travel times from the signals are converted into distances and used to
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determine the ships position.
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GRAIG,
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I wasn't sure about the accuracy of the systems at their best, that is
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why there are blanks. Also wasn't sure about the model # of the Ashtech.
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Got Help?
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For A-1-90-WO, we would appreciate any information on -- contract, days at sea, dive count, funding, information specialist, information to be derived, kms of navigation, national plan, NGDC Info, owner, project number, publications, purpose, scanned materials, seismic description, station count, station description, submersible, summary, tabulated info.
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