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Vessel Data and Contact Information for the
Ryofu Maru

Last Updated - 10/30/2003
Main Activities
Capacities & Workspaces
Range, Speed, Endurance
DP Equipment
CTD Specs
Coring Specs
Underwater Vehicles
Diving Capabilities
Engineering Design
Navigation & Communications
Acoustics & Profiling
Winches, Gantries & Cranes
Country: Japan

NODC Code:

    Call Sign: JGQH
Owner: Ministry of Land, Infrastructure and Transport
Operator: Japan Meteorological Agency
Contact: Director, Marine Division, JMA
Address: Marine Division, Climate and Marine Dept. JMA
1-3-4 Otemachi Chiyoda-ku
Tokyo 100-8122 Japan
Telephone: 03 32114966
Fax: 32112031
Year Built: 1995
Ship URL: Link to Ship Home Page

Ship Schedule URL:


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Main Dimensions

  Length OA: 82  m
  Breadth: 13  m
  Freeboard to working deck: 2.2  m
  Max. draft: 4.71  m

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Main Vessel Activity

  Main Activity: Oceanography and Meteorological Observation
  Operating Area: The Western North Pacific
  Navy Grids Supported:

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Capacities and Working Spaces

  Gross tonnage: 1380  GRT
  Dry cargo holds: Unknown
  Fuel: 516.94  m3
  Wet Labs Area: 94  m2
  Dry Lab Area: 51  m2
  Fresh Water
 Storage Capacity:
536.83  m3
  Fresh Water Generator Capacity: 10  m3/day
  Scientific Clean Water Generation: Millipore
  Free Working Deck Area: Unknown
  Space for container lab: Unknown
  Radioactive Isotope Work Areas: Yes  m

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Range, Speed and Endurance

  Range: 10000  nautical miles
  Cruising Speed: 14  kts.
  Max. Speed: 16.4  kts.
  Endurance: 50  days

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  Officers: 11
  Other crew: 20
  Scientists: 13
  Air Conditioned: Unknown

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Data Processing Equipment:

  Computers: Yes
  Printing/Plotting: Yes

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CTD Specifications:

  CTD Aboard: Yes
  CTD Type: Seabird(SBE), 9 Plus
  CTD Tow able: No
  CTD Oxygen Sensing: No
  CTD Transmissivity: No
  CTD Fluormeter: No
  CTD Rosette: Seabird(SBE), (24 Bottles)

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Coring Specifications:

  Coring Capabilities Aboard: No
  Grab Sampler: No
  Box Corer: No
  Gravity Corer: No
  Piston Corer: No
  Multi Corer: No

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Underwater Vehicle Capabilities:

  Underwater Vehicle Support: No
  ROVs: No
  AUVs: No
  Submersibles: No

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Diving Support:

  Diving Capabilities: No

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Engineering Design Particulars


Ice Breaking Ability:


Hull Materials:

  Dynamic Positioning Ability: Unknown
  Engines: Main engine(s): number:  1   make:  4-stroke Diesel engine
Power (BHP) each engine:  4000ps at 500r.p.m
Propeller Diameter:  3.2   m Max. RPM:   230
Total power auxiliary diesels:  1980   HP
  Electrical Systems:  


 Voltages: 0/440V
     kVA: 550
    Phases: 3


60  Hz

Stabilized System:   VAC  Unknown  AMPs   Unknown  Hz



  24V   Volts with  N/A  Volts Max


Fixed Equipment

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Navigation and Communication:

  Navigational Equipment: Radar, DGPS, Gyro, Dop Log.
  Communications Equipment: Fax, SatCom
  Satellite Communications Equipment: Inmarsat C, B
  GPS: Furuno DGPS

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Acoustics and Profiling:

  Echosounders: 12kHz
  Sonar Type: NEC
  Sea Surface Mapping System: No
  Side Scanning: No
  Multibeam: none
  Acoustic Doppler Current Profiler: RDI, 75kHz
  Silent Ship Operations: Yes

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  Winches: 3  
    Steel Wire Length: 8000  m,  safe working load:  4.8  tons
    Conducting Cable Length:  7000  m , safe working load:  5  tons
    Trawl winch length:  8000  m , safe working load:  2  tons
    Other Winches:
      Length:  2000  m , safe working load:  0.9  tons
  Gantry: Position: Stern

Clearance above deck:  5  m , and outboard extension:  2  m


Safe working load at maximum reach:  5  tons

  Crane: Position: Stern

Clearance above deck:  14  m  and outboard extension:  3  m


Safe working load at maximum reach:  1  tons

  Other:   Unknown

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Vessel Construction and Maintenance Supervision

  Construction Supervised by: Unknown
  Classification Society: Unknown
  Others, Specify: Unknown
OCEANIC - Ships Schedules & Information Pages
University of Delaware, College of Earth, Ocean, and Environment
Lewes, Delaware  19958
Phone:  (302) 645-4225