Survey Identifier: HM7404
Format Acronym: MGD77
Data Center File Number: J1030023
Parameters Surveyed Code: 5
File Creation Date (yyyymmdd): 19880927
Source Institution: HYDROGRAPHIC DEPT. M.S.A.
Country: JAPAN
Platform Name: MEIYO
Platform Type Code: 1
Platform Type: SHIP
Project: ENSHU NADA 2
Survey Departure Date (yyyymmdd): 1974
Survey Arrival Date (yyyymmdd): 1974
Magnetics Instrumentation: PROTON MAG
Topmost Latitude of Survey: +36
Bottommost Latitude: +32
Leftmost Longitude: +137
Rightmost Longitude: +139
General Digitizing Rate of Bathymetry: 100
General Sampling Rate of Bathymetry: 1/SECOND
Assumed Sound Velocity: 15000
Bathymetric Datum Code: 07
General Digitizing Rate of Magnetics: 050
General Sampling Rate of Magnetics: 60
Magnetic Sensor Tow Distance: 250
Reference Field Code: 03
Reference Field: DGRF
Method of Applying Residual Field: DIURNAL CORRECTIONS USING OBSERVATORY DATA
Additional Documentation: magnetics has no times OLD NGDC:56070023
Number of Data Records: 4527
Min/Max Data Record:
Latitude: +32.99525
Longitude: +137.77811
Magnetics Total Field, 1st Sensor: 445300
Magnetics Residual Field: -03649
Min/Max Data Record:
Latitude: +35.12071
Longitude: +138.97665
Magnetics Total Field, 1st Sensor: 461200
Magnetics Residual Field: +05282