YOKOGAWA CMZ 700 GYROCOMPASS
YOKOGAWA DENSHIKIKI CO., LTD.
Refurbished
The YOKOGAWA CMZ-700 Series is a marine gyrocompass system developed for accurate ship heading measurement and distribution to bridge navigation equipment. The system family includes CMZ700B, CMZ700S and CMZ700D configurations, designed for different single- and dual-gyro installations.
The supplied SM MARINE SERVICE™ photograph shows two operational CMZ-700-type master compass assemblies with their front covers removed, exposing the gyro/container assemblies. Because the detailed nameplates are not visible in the photograph, the exact B/S/D variant should be confirmed from the equipment nameplate before replacement parts are ordered.
Manufacturer: YOKOGAWA DENSHIKIKI CO., LTD.
Brand: YOKOGAWA / YDK
Country of Origin / Brand Origin: Japan
Series: CMZ-700 / CMZ700 Series
Known Variants: CMZ700B, CMZ700S, CMZ700D
Product Type: Marine Gyrocompass
Main Master Compass: MKM022
Marine Application: Ship heading determination and heading-data distribution
Associated Equipment: Control Box, repeater compasses, link/interface units, AC adapter and connection equipment
The CMZ700 series was engineered for marine navigation installations requiring stable heading information for bridge equipment such as autopilot, radar and other heading-data users.
The CMZ700 series is built around the MKM022 Master Compass. Technical documentation describes three principal configurations.
CMZ700B can drive repeaters directly from the master compass without requiring a separate control box.
CMZ700S uses a control box to provide additional inputs and outputs.
CMZ700D is designed for dual-gyrocompass arrangements.
One important feature of the CMZ700 design is its improved vibration and shock resistance. Documentation describes the use of a universal joint, outer bellows damper, rubber isolators and other anti-vibration arrangements around the gyro mechanism.
A gyrocompass determines true north using gyroscopic principles rather than the Earth's magnetic field.
On a ship, the CMZ700 produces heading information that can be distributed to navigation and steering equipment. Depending on configuration, its outputs can support equipment such as:
• Autopilot
• Radar
• ECDIS
• AIS
• VDR / S-VDR
• Heading repeaters
• Course recorder
• Integrated bridge systems
CMZ700 technical documentation specifies IEC 61162-1 serial heading interfaces and RS-422 communication, allowing heading information to be supplied electronically to compatible bridge equipment.
• Compact marine gyrocompass design
• MKM022 Master Compass
• High vibration and shock resistance
• Maximum follow-up speed up to 30°/second
• 24 VDC ship's battery operation
• Optional AC operation
• External heading sensor backup capability
• Restart timer adjustable from 1–99 hours
• IEC 61162-1 compatible serial interfaces
• RS-422 heading-data communication
• Repeater compass outputs
• Optional automatic speed-error correction
• Suitable for single and dual gyro arrangements
• Heading, rate-of-turn and additional signal outputs depending on configuration
The system's reduced container mass was specifically intended to improve follow-up performance during rapid vessel turns.
| Specification | CMZ700 Series |
|---|---|
| Standard Power | 24 VDC |
| DC Input Range | 20–30 VDC |
| Optional AC Supply | 100 / 110 / 115 / 230 VAC, 50/60 Hz |
| Settling Time | Within 5 hours |
| Practical Operational State | Approx. 2 hours |
| Follow-up Accuracy | Within 0.1° |
| Maximum Follow-up Speed | 30°/sec |
| Serial Interface | RS-422 |
| Serial Standard | IEC 61162-1 |
| Selectable Serial Rate | 2400 / 4800 / 9600 bps for documented outputs |
| Maximum Roll | ±40° |
| Maximum Pitch | ±40° |
| Master Compass Temperature | -10°C to +50°C |
| Other Protected Equipment | -15°C to +55°C |
The published CMZ700B specification states static accuracy within approximately ±0.25° × sec(latitude) and dynamic accuracy within ±0.75° × sec(latitude) under the specified conditions.
The MKM022 is the central master compass assembly of the CMZ700 system. It contains the gyro mechanism and associated electronics required to establish and output the ship's heading.
The MKC320 is documented as the control box used with the CMZ700S configuration, providing expanded system interfaces and repeater/output functionality.
The optional MKR024 Link Unit expands the system and supports functions including automatic speed-error correction using ship-speed and latitude information.
The optional MKR027 AC Adapter allows operation from the vessel's AC power supply while supporting the gyro's DC power arrangement.
The MKR050 is a documented repeater compass associated with the CMZ700 series.
The MKN016 Connection Unit appears in documented CMZ700 system configurations for connection and distribution of signals between system components.
YOKOGAWA CMZ-700 gyrocompasses can be used aboard:
• Cargo ships
• Bulk carriers
• Container vessels
• Tankers
• Offshore vessels
• Tugboats
• Fishing vessels
• Passenger vessels
• General merchant ships
Once stabilized, gyro heading can be distributed throughout the bridge navigation system, making the master compass an important reference source for steering and navigation equipment.
Check the vessel's 24 VDC supply, circuit protection, terminals, wiring and power connections. Where an AC adapter is installed, its input and DC output should also be checked.
The CMZ700 specification gives a full settling time of up to approximately five hours, although an operational state is reached in about two hours. Persistent heading instability beyond normal settling requires further investigation.
Check latitude and speed-related correction settings, vessel inputs and master-compass alignment. A persistent deviation may require technical inspection of the gyro mechanism or associated electronics.
Check repeater power, output circuits, signal wiring, terminal connections and the master compass heading output.
Inspect the RS-422 / IEC 61162-1 connection and confirm that the correct heading sentence and communication settings are selected.
Loose terminals, damaged cabling, unstable power, deteriorated electronic components or faults within the gyro/container assembly can cause intermittent heading information.
Because the gyro assembly relies on a carefully isolated mechanical system, unusual vibration or noise should be investigated by experienced gyrocompass service personnel rather than continuing operation indefinitely.
Documented CMZ700 interfaces include system failure alarm and power failure alarm contact outputs.
The CMZ700B instruction manual also contains a dedicated Error Code List and troubleshooting section. Exact codes should be matched to the applicable manual and equipment configuration rather than guessed.
• Keep the master compass installation clean and dry.
• Maintain proper ventilation around electronic equipment.
• Inspect the 24 VDC supply periodically.
• Check terminals and connectors for corrosion or looseness.
• Verify gyro heading against appropriate navigation references.
• Confirm repeater indications follow the master compass correctly.
• Inspect external heading, latitude and speed inputs where installed.
• Do not disturb the gyro/container mechanism unnecessarily.
• Record operating hours and maintenance history.
• Use trained marine gyro technicians for internal gyro mechanism servicing.
SM MARINE SERVICE™ can support sourcing of YOKOGAWA CMZ-700 gyrocompass systems and spare parts, subject to exact model and stock availability.
Typical requirements may include:
• CMZ700 complete gyrocompass
• CMZ700B complete system
• CMZ700S complete system
• MKM022 Master Compass
• Gyro sphere / sensitive element
• Gyro container assembly
• MKC320 Control Box
• MKR024 Link Unit
• MKR027 AC Adapter
• MKR050 Repeater Compass
• MKN016 Connection Unit
• PCB assemblies
• Power supply components
• Stepper / follow-up components
• Interface modules
• Terminal boards
• Cables and connectors
• Internal electronic and mechanical parts
New, used, refurbished, reconditioned and tested-working equipment can be sourced depending on availability.
For an exact replacement, buyers should provide the model, type code, serial number, nameplate photograph and photographs of the existing component before ordering.
The CMZ700 remains important on vessels where the existing navigation and steering systems were designed around its heading interfaces and repeater network.
Its rugged mechanical construction, 24 VDC operation, fast follow-up capability and availability of multiple system configurations made it suitable for a wide range of merchant vessels. The CMZ700 specification also documents compliance with IMO Resolution A.424(XI) gyrocompass performance standards and JIS-F9602 Class A.
For an existing CMZ700-equipped vessel, repairing or sourcing a compatible master compass, control box, gyro element or repeater can sometimes be more practical than immediately modifying every connected bridge system.
The CMZ-700 is a marine gyrocompass series designed to provide accurate true-heading information for ship navigation and steering systems.
The documented manufacturer is YOKOGAWA DENSHIKIKI CO., LTD., Japan.
Technical documentation identifies CMZ700B, CMZ700S and CMZ700D configurations.
The main documented master compass is MKM022.
The CMZ700S system documentation identifies the MKC320 Control Box.
SM MARINE SERVICE™ can support sourcing of complete CMZ700 systems, master compasses and associated spare parts depending on stock.
Yes. Used, refurbished, reconditioned and tested-working equipment can be sourced subject to availability.
Availability varies because of the age and exact version of the system. Send the existing unit's nameplate and photographs to SM MARINE SERVICE™ for matching.
Common service requirements include power faults, incorrect heading, failure to settle, repeater problems, heading-output communication faults, mechanical/gyro problems and deteriorated electronic components.
Yes. Worldwide marine equipment sourcing and shipping can be arranged subject to stock and destination.
YOKOGAWA CMZ-700 Gyrocompass is a marine true-heading system used for vessel navigation and distribution of gyro heading to equipment such as autopilot, radar, ECDIS and heading repeaters. SM MARINE SERVICE™ can support sourcing of CMZ700 complete systems, MKM022 master compass units, MKC320 control boxes, gyro components, repeater units and related spare parts in used, refurbished, reconditioned and tested-working condition, subject to availability.
SM MARINE SERVICE™
Marine Automation & Navigation Equipment Supplier
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
Contact Information
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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