Survey Identifier: YUCAT1-3
Format Acronym: MGD77
Data Center File Number: 07270002
Parameters Surveyed Code: 55511
File Creation Date (yyyymmdd): 19851127
Source Institution: OREGON STATE UNIV., CONMAR STUDY GROUP
Country: USA
Platform Name: B.O. ALTAIR
Platform Type Code: 1
Platform Type: SHIP
Chief Scientist(s): RICHARD COUCH, GORDON NESS
Project: YUCATAN85 LEGS A, B & C
Funding: OFFICE OF NAVAL RES.
Survey Departure Date (yyyymmdd): 19850324
Port of Departure: PROGRESO ,YUCATAN, MEXICO
Survey Arrival Date (yyyymmdd): 19850524
Port of Arrival: PROGRESO, YUCATAN, MEXICO
Navigation Instrumentation: ARGO NAVCUBE/MAGNAVOX 1107RS SAT. RCVR.
Geodetic Datum/Position: ARGO
Bathymetry Instrumentation: EDO-WESTERN 12KHZ.
Additional Forms of Bathymetric Data: ANALOG RECORDS
Magnetics Instrumentation: GEOMETRICS G801/3 PROTON PRECESSION
Additional Forms of Magnetics Data: ANALOG RECORDS
Gravity Instrumentation: LACOSTE AND ROMBERG S42
Additional Forms of Gravity Data: ANALOG RECORDS
Topmost Latitude of Survey: +26
Bottommost Latitude: +19
Leftmost Longitude: -093
Rightmost Longitude: -086
General Digitizing Rate of Bathymetry: 030
General Sampling Rate of Bathymetry: 1/SECOND
Assumed Sound Velocity: 14630
Bathymetric Datum Code: 00
Interpolation Scheme: (DATA NOT INTERPOLATED, 3 MIN. INTERVALS ,PEAKS&TROUGHS)
General Digitizing Rate of Magnetics: 030
General Sampling Rate of Magnetics: 10
Magnetic Sensor Tow Distance: 200
Sensor Depth: 150
Reference Field Code: 88
Reference Field: IGRF85
Method of Applying Residual Field: REFERENCE FIELD CALCULATED AT POINT-POSITION
General Digitizing Rate of Gravity: 030
General Sampling Rate of Gravity: 10
Theoretical Gravity Formula Code: 3
Theoretical Gravity Formula: IAG GRS 67 SYSTEM
Reference System Code: 3
Reference System: IGSN 71 SYSTEM
Corrections Applied: .00368 MILLIGALS/DAY
Departure Base Station Gravity: 9787226
Departure Base Station Description: DOD 1764-1, LAGSN 9863-62
Arrival Base Station Gravity: 9787226
Arrival Base Station Description: DOD1764-1, LAGSN9863-62
Additional Documentation: TYPE 3 RECORDS (DATA) ARE ENCODED WITH INFORMATION TO ALLOW DISCERNMENT OF THE, TYPE OF NAVIGATION SYSTEM (ARGO OR TRANSIT SAT-DR) USED TO ACQUIRE NAV. DATA, COLUMN 45 OF THE DATA RECORD CONTAINS A 1,2,4, OR 5 WITH 1 & 2 REPRESENTING, ARGO NAVIGATION, AND 4 & 5 REPRESENTING TRANSIT SATELLITE DEAD-RECKONING. THIS, IS A DEPARTURE FROM ADHERENCE TO THE MGD-77 FORMAT SPECIFICATION. CARTER TABLES WERE USED TO CORRECT THE BATHYMETRY DATA FOR SOUND VELOCITY, CHANGES DUE TO DEPTH.
Number of Data Records: 14048
Min/Max Data Record:
Date: 1985 03 28
Latitude: +19.77516
Longitude: -92.79188
Bathymetry, 2- Way Traveltime: 000050
Bathymetry, Corrected Depth: 4.0
Magnetics Total Field, 1st Sensor: 443490
Magnetics Residual Field: -04659
Observed Gravity: 9786204
Free-Air Anomaly: -1159
Min/Max Data Record:
Date: 1985 05 24
Latitude: +25.16535
Longitude: -86.23957
Bathymetry, 2- Way Traveltime: 051750
Bathymetry, Corrected Depth: 3897.0
Magnetics Total Field, 1st Sensor: 476470
Magnetics Residual Field: +04633
Observed Gravity: 9789546
Free-Air Anomaly: +1082