Because without that manual, true north becomes a guess—and at sea, a guess is never good enough.
| Unit | Function | |------|----------| | Master Compass (CMZ-900) | Contains gyro sphere, gravity ball, follow-up system | | Power Supply Unit (PSU) | Converts ship’s AC to required voltages | | Control/Distribution Box | Connects repeaters, alarms, remote start | | Repeaters | Remote digital or analog heading indicators | | Alarm Unit | Visual/audible for latitude error, gyro spin fault, power fail | Yokogawa Gyro Compass Cmz 900 Manual
The primary function of the CMZ 900 manual is to bridge the gap between the complex mechanics of the gyrocompass and the practical needs of the deck officer. The manual provides a step-by-step operational guide, from the initial start-up sequence to the dissemination of heading data to peripheral equipment such as Autopilots, Radar, and ECDIS (Electronic Chart Display and Information System). Because without that manual, true north becomes a
Single-unit for merchant vessels with varied input/output needs. CMZ 900D: Dual-unit system for enhanced redundancy. Operational Highlights If >30 min, power cycle
| Alarm / Symptom | Possible Cause | Corrective Action | |----------------|----------------|---------------------| | (steady buzzer) | Gyro RPM low, motor failure, bearing seizure | Wait? If >30 min, power cycle. Check fuse in PSU. | | Follow‑up Alarm | Photocell dirty, servo motor stalled | Clean optics inside master unit. Check servo fuse. | | Latitude Alarm | Latitude set incorrectly, or ship >70° lat | Verify latitude dial. Reduce speed/delay readings. | | Heading drifts >1°/min | Gyro sphere not settled, temperature gradient | Let run 1 more hour. Check heater in master case. | | No output to repeaters | Step driver IC failure or loose connector | Swap spare repeater channel. Check termination. | | Repeater 180° reversed | Synchro wiring swapped (S1/S2) | Swap S1 and S2 leads at repeater. |