Survey Identifier: C2912

Format Acronym: MGD77
Data Center File Number: 01010300
Parameters Surveyed Code: 55531
File Creation Date (yyyymmdd): 19901121
Source Institution: Lamont-Doherty Geological Observatory
Country: United States
Platform Name: R/V Conrad
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): Drs. Purde and Sempere
Project: c2912
Funding: NSF
Survey Departure Date (yyyymmdd): 19881202
Port of Departure: Cadiz
Survey Arrival Date (yyyymmdd): 19890107
Port of Arrival: Azores
Navigation Instrumentation: GPS, transit satellite, and furuno
Geodetic Datum/Position: dead reconing
Bathymetry Instrumentation: seabeam vertical beam
Additional Forms of Bathymetric Data: 3.5 PDR
Magnetics Instrumentation: proton procession
Gravity Instrumentation: Bell BGM-3
Topmost Latitude of Survey: +38
Bottommost Latitude: +27
Leftmost Longitude: -045
Rightmost Longitude: -006
General Digitizing Rate of Bathymetry: 10
General Sampling Rate of Bathymetry: VAR W/ DEPTH
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 0
General Digitizing Rate of Magnetics: 10
Reference Field Code: 4
Reference Field: IGRF-75
General Digitizing Rate of Gravity: 10
Theoretical Gravity Formula Code: 2
Reference System Code: 2
Reference System: Potsdam
Departure Base Station Gravity: 9798495
Departure Base Station Description: closed RR station in Rota, Spain
Arrival Base Station Gravity: 9801246
Arrival Base Station Description: benchmark at university
Additional Documentation: Other data reported to have been collected on this cruise were backscatter. Navigation for the multibeam bathymetry was adjusted to match bathymetry in, the survey area.
Number of Data Records: 49653

Min/Max Data Record:
Date: 1988 12 02
Latitude: +27.83411
Longitude: -44.26817
Bathymetry, 2- Way Traveltime: 000686
Bathymetry, Corrected Depth: 51.0
Magnetics Total Field, 1st Sensor: 406630
Magnetics Residual Field: -05220
Observed Gravity: 9790835
Free-Air Anomaly: -0582

Min/Max Data Record:
Date: 1989 01 05
Latitude: +37.72639
Longitude: -6.29591
Bathymetry, 2- Way Traveltime: 071858
Bathymetry, Corrected Depth: 5453.0
Magnetics Total Field, 1st Sensor: 432940
Magnetics Residual Field: +07450
Observed Gravity: 9803130
Free-Air Anomaly: +3431