Survey Identifier: DI110L1
Format Acronym: MGD77
Data Center File Number: 19100022
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19850201
Source Institution: INSTITUTE OF OCEANOGRAPHIC SCIENCES, UK
Country: UNITED KINGDOM
Platform Name: DISCOVERY
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): R. C. SEARLE
Project: DISCOVERY CRUISE 110 LEG 1
Funding: N.E.R.C.
Survey Departure Date (yyyymmdd): 19800422
Port of Departure: PANAMA
Survey Arrival Date (yyyymmdd): 19800520
Port of Arrival: LIMA, PERU
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
Topmost Latitude of Survey: +08
Bottommost Latitude: -14
Leftmost Longitude: -107
Rightmost Longitude: -077
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: 250
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: 9782232
Departure Base Station Description: BALBOA PANAMA PIER 18 WHOI 823
Arrival Base Station Gravity: 9782978
Arrival Base Station Description: CALLAO 36827M
Additional Documentation: BATHYMETRY - SOME DIGITISED AT 2 MINS, GRAVITY BASE BALBOA IS IGSN71 ESTIMATE OF POTSDAM 978239.2 IN CRUISE RECORDS, HOWEVER THE BASE STATION DESCRIPTION GIVES POTSDAM G=978237.5 WITHOUT FA CORR, NO LEG DRIFT ONLY TOTAL CRUISE DRIFT OF +0.05 MGAL/DAY - REF CRUISE REPORT
Number of Data Records: 19529
Min/Max Data Record:
Date: 1980 04 23
Latitude: -13.52830
Longitude: -106.38870
Bathymetry, Corrected Depth: 391.0
Magnetics Total Field, 1st Sensor: 271600
Magnetics Residual Field: -08420
Free-Air Anomaly: -1730
Min/Max Data Record:
Date: 1980 05 20
Latitude: +7.95250
Longitude: -77.50770
Bathymetry, Corrected Depth: 6345.0
Magnetics Total Field, 1st Sensor: 356000
Magnetics Residual Field: +06590
Free-Air Anomaly: +1140