Survey Identifier: DI118L1
Format Acronym: MGD77
Data Center File Number: 19100026
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19850202
Source Institution: INSTITUTE OF OCEANOGRAPHIC SCIENCES, UK
Country: UNITED KINGDOM
Platform Name: DISCOVERY
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): T. J. G. GRANCIS
Project: DISCOVERY CRUISE 118 LEG 1
Funding: N.E.R.C.
Survey Departure Date (yyyymmdd): 19810216
Port of Departure: GIBRALTAR
Survey Arrival Date (yyyymmdd): 19810310
Port of Arrival: MADEIRA
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: LACOSTE AND ROMBERG S84
Additional Forms of Gravity Data: ANALOGUE
Topmost Latitude of Survey: +37
Bottommost Latitude: +24
Leftmost Longitude: -032
Rightmost Longitude: -005
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: 88
Reference Field: IGRF-80
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: 9797758
Departure Base Station Description: GIBRALTAR BOL9 WEST PIER NORTH M
Arrival Base Station Gravity: 9797694
Arrival Base Station Description: FUNCHAL MADEIRA - HARBOUR BOL 4
Additional Documentation: GIBRALTAR GRAVITY STA IS FROM SHIP TIE BY RVS AT NO9 BOLLARD BERTH 2 ECHO WEST, PIER NORTH MOLE. SHIP WAS 200M FROM THIS POSTITION, LEG DRIFT = +0.04 MGAL/DAY
Number of Data Records: 15557
Min/Max Data Record:
Date: 1981 02 16
Latitude: +24.26750
Longitude: -31.16020
Bathymetry, Corrected Depth: 100.0
Magnetics Total Field, 1st Sensor: 373700
Magnetics Residual Field: -06680
Free-Air Anomaly: -1100
Min/Max Data Record:
Date: 1981 03 10
Latitude: +36.53900
Longitude: -5.42100
Bathymetry, Corrected Depth: 6206.0
Magnetics Total Field, 1st Sensor: 429920
Magnetics Residual Field: +06160
Free-Air Anomaly: +1220