Survey Identifier: YUCAT-TR
Format Acronym: MGD77
Data Center File Number: 07270001
Parameters Surveyed Code: 51511
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 GALVESTON TO PROGRESO TRANSIT
Funding: OFFICE OF NAVAL RES.
Survey Departure Date (yyyymmdd): 19850322
Port of Departure: GALVESTON, TEXAS, USA
Survey Arrival Date (yyyymmdd): 19850324
Port of Arrival: PROGRESO, YUCATAN, MEXICO
Navigation Instrumentation: ARGO NAVCUBE/MAGNAVOX 1107RS SAT. RCVR.
Geodetic Datum/Position: TRANSIT-SATELLITE DEAD-RECKONING ONLY
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: +29
Bottommost Latitude: +21
Leftmost Longitude: -095
Rightmost Longitude: -089
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: 1116
Min/Max Data Record:
Date: 1985 03 22
Latitude: +21.54085
Longitude: -94.31727
Bathymetry, 2- Way Traveltime: 000200
Bathymetry, Corrected Depth: 15.0
Observed Gravity: 9787273
Free-Air Anomaly: -1081
Min/Max Data Record:
Date: 1985 03 24
Latitude: +28.62262
Longitude: -89.80168
Bathymetry, 2- Way Traveltime: 049825
Bathymetry, Corrected Depth: 3750.0
Observed Gravity: 9792207
Free-Air Anomaly: +0451