Survey Identifier: HM7104
Format Acronym: MGD77
Data Center File Number: J1030020
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
Survey Departure Date (yyyymmdd): 19710823
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19711012
Port of Arrival: TOKYO
Magnetics Instrumentation: PROTON MAG
Topmost Latitude of Survey: +41
Bottommost Latitude: +39
Leftmost Longitude: +141
Rightmost Longitude: +145
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: 0250
Reference Field Code: 03
Reference Field: IGRF-65
Method of Applying Residual Field: DIURNAL CORRCTIONS USING OBSERVATORY DATA
Additional Documentation: CRUISE NAME:SANRIKU OKI, magnetics records have no times OLD NGDC:56070020
Number of Data Records: 2579
Min/Max Data Record:
Date: 1971 09 17
Latitude: +39.10741
Longitude: +141.87684
Magnetics Total Field, 1st Sensor: 462800
Magnetics Residual Field: -03897
Min/Max Data Record:
Date: 1971 10 08
Latitude: +40.28581
Longitude: +144.80095
Magnetics Total Field, 1st Sensor: 482300
Magnetics Residual Field: +04437