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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 -- crew, information to be derived, equipment used, information specialist, publications, purpose, summary.
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