Survey Identifier: HM6904
Format Acronym: MGD77
Data Center File Number: J1030019
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): 19691006
Port of Departure: TOKYO
Survey Arrival Date (yyyymmdd): 19691126
Port of Arrival: TOKYO
Magnetics Instrumentation: PROTON MAG
Topmost Latitude of Survey: +34
Bottommost Latitude: +32
Leftmost Longitude: +134
Rightmost Longitude: +137
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: IGRF-65
Method of Applying Residual Field: DIURNAL CORRECTIONS USING OBSERVATORY DATA
Additional Documentation: CRUISE NAME:NANKAI OKI, magnetics has poor nav, no times, OLD NGDC:56070019
Number of Data Records: 2471
Min/Max Data Record:
Latitude: +32.31188
Longitude: +134.48885
Magnetics Total Field, 1st Sensor: 450400
Magnetics Residual Field: -02053
Min/Max Data Record:
Latitude: +33.99985
Longitude: +136.70881
Magnetics Total Field, 1st Sensor: 462700
Magnetics Residual Field: +00289