Survey Identifier: RNDB15WT


Format Acronym: MGD77
Data Center File Number: 15040218
Parameters Surveyed Code: 55331
File Creation Date (yyyymmdd): 19890914
Source Institution: SCRIPPS INSTITUTION OF OCEANOGRAPHY
Country: USA
Platform Name: R/V T.WASHINGTON
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): J.HAWKINS
Project: ROUNDABOUT LEG 15
Survey Departure Date (yyyymmdd): 19890201
Port of Departure: NUKA'ALOFA, TONGA
Survey Arrival Date (yyyymmdd): 19890303
Port of Arrival: PAGO PAGO, SAMOA
Navigation Instrumentation: SATNAV/GPS,AUTO LOG GYRO+2D DOPPLER SPD
Geodetic Datum/Position: LINEAR INTERP.BETWEEN ADJACENT FIXES
Bathymetry Instrumentation: SEABEAM VERTICAL BEAM (2&2/3 DEG) & 3.5
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,35MM FILM,DIGITAL MAG. TAPE
Gravity Instrumentation: BELL BGM-3 METER
Additional Forms of Gravity Data: DIGITAL MAG TAPE
Seismic Instrumentation: NONE COLLECTED
Topmost Latitude of Survey: -14
Bottommost Latitude: -22
Leftmost Longitude: -178
Rightmost Longitude: -170
General Digitizing Rate of Bathymetry: 010
General Sampling Rate of Bathymetry: 1PING IN H2O
Assumed Sound Velocity: 15000
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-1985
Method of Applying Residual Field: LIN.INTERP.POINTS WITHIN ONE DEGREE SQUARE
General Digitizing Rate of Gravity: 010
General Sampling Rate of Gravity: 01
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: SYSTEM IGSN 71
Corrections Applied: EOTVOS AND METER DRIFT
Departure Base Station Gravity: 9786094
Departure Base Station Description: SUVA, FIJI DOD 0352-1
Arrival Base Station Gravity: 9786418
Arrival Base Station Description: PAGO PAGO DOD 2050-3
Additional Documentation: SYST_COMMENTS DEPTHS CORRECTED FOR 5 METER SHIP DRAFT, 12.158 kHz, 16 beams. NAVI_INSTRU Amatec-Straza 2-D Doppler speed log, Sperry MK-27 Gyro, etc. NGDC has multibeam bathymetric data for this cruise, however the tracklines, found here in GEODAS may not exactly correspond to the multibm data available. GRAVITY: NO FUNDING, NOT IN THIS FILE. GRAVITY: 1 SEC METER COUNTS FILTERED, WITH 25 POLE FILTER WITH 148 SEC DELAY. FREE AIR ANOMALY SPIKES PRESENT, BECAUSE SAME FILTER NOT USED FOR NAVIGATION.
Number of Data Records: 42287

Min/Max Data Record:
Date: 1989 02 01
Latitude: -21.08399
Longitude: -177.86481
Bathymetry, 2- Way Traveltime: 000440
Bathymetry, Corrected Depth: 33.0
Magnetics Total Field, 1st Sensor: 390880
Magnetics Residual Field: -08615

Min/Max Data Record:
Date: 1989 03 03
Latitude: -14.27453
Longitude: -170.66583
Bathymetry, 2- Way Traveltime: 101920
Bathymetry, Corrected Depth: 7781.0
Magnetics Total Field, 1st Sensor: 438380
Magnetics Residual Field: +07022