Yokogawa Gyro Compass Cmz | 900 Manual

The Yokogawa CMZ900 is a modular gyrocompass series designed for merchant vessels to provide highly accurate heading information. It is widely regarded for its reliability, utilizing a unique "bridge support" system and a modular design that facilitates easy maintenance. System Overview and Key Models

Annual Inspections: To comply with SOLAS requirements, the gyrocompass should undergo an annual performance test by a certified technician. Yokogawa Gyro Compass Cmz 900 Manual

• Clean master compass ventilation filter.
• Check follow‑up motor coupling screws (tight).
• Verify latitude dial scale matches actual ship lat.

• Apply mains power → standby lamp lights.
• Press “Start” → gyro wheel spins up (audible whine).
• After ~3 hours, “Settle” lamp turns off → compass is on true north.

| Alarm Code (Lamp) | Meaning (per manual) | Action | | :--- | :--- | :--- | | Power Fail | CP 900 output missing | Check fuses; measure 24V DC backup | | Gyro Not Settled | Rotor speed <18,000 RPM | Wait; check motor current | | Follow-up Error | Repeater not matching master | Clean slip rings (Section 6.3) | | High Temp | Cooling fan failed | Clean filter; check thermal switch | The Yokogawa CMZ900 is a modular gyrocompass series

Warning: Avoid “free download” sites that require a credit card or software installation. Legitimate manuals are typically behind paywalls sponsored by ship chandlers. Clean master compass ventilation filter

The Gyrosphere (MKT007): The "heart" of the system. It contains a fast-spinning rotor suspended without friction, utilizing the Earth's rotation and gravity to point toward true north. In emergencies, the manual notes that the ship's crew can actually replace this unit themselves.