Survey Identifier: MRTN10WT


Format Acronym: MGD77
Data Center File Number: 15040132
Parameters Surveyed Code: 55533
File Creation Date (yyyymmdd): 19
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V T.WASHINGTON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): FOX J.,MACDONALD K.
Project: MARATHON LEG 10
Funding: ONR-0440
Survey Departure Date (yyyymmdd): 19841215
Port of Departure: RIO DE JANEIRO,BRAZIL
Survey Arrival Date (yyyymmdd): 19850116
Port of Arrival: CAPETOWN,S.AFRICA
Navigation Instrumentation: SATNAV,AUTO LOG GYRO+2D DOPPLER SPD LOG
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERT.BEAM(2&2/3DEG)&3.5KHZ(WIDE)
Additional Forms of Bathymetric Data: ANAL.REC,35MM FILM,DIGITAL MAG. TAPE
Magnetics Instrumentation: GEOMETRICS MAGNETOMETER MOD G-801/3
Additional Forms of Magnetics Data: ANAL.REC,DIGITAL MAG. TAPE
Gravity Instrumentation: ASKANIA GSS2,ANSCHUTZ ELECT. GYRO TABLE
Additional Forms of Gravity Data: ANAL.REC,35MM FILM,DIGITAL MAG.TAPE
Seismic Instrumentation: WATERGUN SOURCE, DIGITAL, 1 CHANNEL
Formats of Seismic Data: ANAL.REC,35MM FILM,DIGITAL MAG.TAPE
Topmost Latitude of Survey: -22
Bottommost Latitude: -38
Leftmost Longitude: -044
Rightmost Longitude: +019
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H20
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: 1 MINUTE AVERAGES EXTRACTED FROM SEABEAM VERTICAL BEAMS
General Digitizing Rate of Magnetics: 010
General Sampling Rate of Magnetics: 06
Reference Field Code: 03
Reference Field: IGRF 1980
Method of Applying Residual Field: LIN.INTERP.POINTS WITHIN ONE DEGREE SQUARE
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 20
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 2
Reference System: POTSDAM SYSTEM
Departure Base Station Gravity: 9787899
Departure Base Station Description: NAT.OBS. OF BRAZIL,DODO128-1
Arrival Base Station Gravity: 9796309
Arrival Base Station Description: U. OF CAPETOWN,MENZIES BLDG.
Additional Documentation: SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 12.158 kHz, 16 beams, time instrumentation = Hewlett-Packard HP-5065A rubidium frequency standard, NAVI_INSTRU Amatec-Straza 2-D Doppler speed log, Sperry MK-27 Gyro, Texas, Instruments GPS Receiver, Mod TI4100, ITT Transit Satellite Receiver, Mod 5001, NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS may not exactly correspond to the multibeam data.
Number of Data Records: 45700

Min/Max Data Record:
Date: 1984 12 15
Latitude: -37.94331
Longitude: -43.20683
Bathymetry, 2- Way Traveltime: 002360
Bathymetry, Corrected Depth: 177.0
Magnetics Total Field, 1st Sensor: 234410
Magnetics Residual Field: -05360
Observed Gravity: 9787924
Free-Air Anomaly: -0970

Min/Max Data Record:
Date: 1985 01 16
Latitude: -22.88249
Longitude: +18.44383
Bathymetry, 2- Way Traveltime: 071693
Bathymetry, Corrected Depth: 5408.0
Magnetics Total Field, 1st Sensor: 278820
Magnetics Residual Field: +06566
Observed Gravity: 9799512
Free-Air Anomaly: +1664