Survey Identifier: DI107L1
Format Acronym: MGD77
Data Center File Number: 19100017
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19850131
Source Institution: INSTITUTE OF OCEANOGRAPHIC SCIENCES, UK
Country: UNITED KINGDOM
Platform Name: DISCOVERY
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): R. B. WHITMARSH
Project: DISCOVERY CRUISE 107 LEG 1
Funding: BRITISH GOVT.
Survey Departure Date (yyyymmdd): 19791228
Port of Departure: PUERTO RICO
Survey Arrival Date (yyyymmdd): 19791230
Port of Arrival: PUERTO RICO
Navigation Instrumentation: MAGNAVOX SATELLITE NAVIGATOR
Geodetic Datum/Position: PRIM-SAT PLUS DEAD RECKONING
Bathymetry Instrumentation: PRECISION ECHO SOUNDER - IOS MK 3
Additional Forms of Bathymetric Data: ANALOGUE
Magnetics Instrumentation: VARIAN V75 PROTON PRECESSION
Additional Forms of Magnetics Data: ANALOGUE
Gravity Instrumentation: LACOST AND ROMBERG S84
Additional Forms of Gravity Data: ANALOGUE
Topmost Latitude of Survey: +21
Bottommost Latitude: +16
Leftmost Longitude: -064
Rightmost Longitude: -060
General Digitizing Rate of Bathymetry: 060
General Sampling Rate of Bathymetry: 2/SEC
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 00
Interpolation Scheme: NONE
General Digitizing Rate of Magnetics: 020
General Sampling Rate of Magnetics: 02
Magnetic Sensor Tow Distance: 0250
Reference Field Code: 04
Reference Field: IGRF-75
Method of Applying Residual Field: LINEAR INTERPOLATION PER DEGREE SQUARE
General Digitizing Rate of Gravity: 060
General Sampling Rate of Gravity: 00
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG SYSTEM 1967
Reference System Code: 3
Reference System: IGSN-71
Corrections Applied: CROSS COUPLING PLUS EOTVOS
Departure Base Station Gravity: 978668
Departure Base Station Description: PIER 10 SAN JUAN NO 2
Arrival Base Station Gravity: 978668
Arrival Base Station Description: PIER 10 SAN JUAN NO 2
Additional Documentation: LEG 1 AND LEG 2 ON DATA TAPES ARE ONE LEG IN CRUISE TIED TO PIER 10 ABOVE, SHIP METER BASE VALUE = 978680.7 ON DEPARTURE ARMY QUAY, = 978680.6 ON ARRIVAL ARMY QUAY AT END OF D107 LEG 2, PIER 10 G VALUE 978668.0 IS IGSN 71 ESTIMATE FROM POTSDAM 978682 -14.0, LEG 1 DRIFT RATE = -0.54 MGAL/DAY
Number of Data Records: 1713
Min/Max Data Record:
Date: 1979 12 28
Latitude: +16.49400
Longitude: -63.50480
Bathymetry, Corrected Depth: 400.0
Magnetics Total Field, 1st Sensor: 391300
Magnetics Residual Field: -06440
Free-Air Anomaly: -2730
Min/Max Data Record:
Date: 1979 12 30
Latitude: +20.10900
Longitude: -60.24370
Bathymetry, Corrected Depth: 7327.0
Magnetics Total Field, 1st Sensor: 416900
Magnetics Residual Field: -02790
Free-Air Anomaly: +0730