Steering Gear · Steering Gear
The Yokogawa CMZ900 is a gyrocompass: a fast-spinning rotor suspended without friction finds true north and so indicates the ship's heading. The source is a July 2007 specification issued by Yokogawa (YDK) for the dual-unit CMZ900D version, so the details below refer to that version. The series is type approved to IMO resolution A.424(XI) and JIS-F9602 class A; at the time of issue JG and MED approvals were under application and CCS was scheduled. Features include manual and automatic speed error correction, heading deviation monitoring and an external heading sensor as backup.
A titanium capsule and electrodes in the gyrosphere keep it pure and lengthen the maintenance interval, and the crew can replace the gyrosphere in an emergency. Settling time is within 5 hours, with usable accuracy in approximately 2 hours. Static accuracy is plus/minus 0.25 degrees x sec Lat. and dynamic accuracy plus/minus 0.75 degrees x sec Lat.; maximum follow-up speed is 30 degrees per second. Heading is output on 3 serial circuits, 4 stepper circuits, 8 repeater compass circuits, 1 analog heading and 1 analog quadrant circuit, and 3 analog rate-of-turn circuits. Serial output is IEC61162-1 at 4800 bps or IEC61162-2 at 38400 bps.
Power is 100 V to 220 V AC with a 24 V DC back-up; AC consumption is approx. 250 VA at start and approx. 200 VA in operation, plus 12 VA per repeater compass (max. 8). The master compass operates between -10 and +50 degrees C. The master compass MKM026 weighs 43 kg as stand-alone style -1 and 51 kg as console style -4; further styles are built into the pilot stand. Options include automatic master compass change-over (/AC) and ROT output ranges of 30, 100 or 300 degrees per minute. The MKZ512 spare parts set contains a gyrosphere support, container base, injector, meter cup, funnel, supporting liquid, 20 filters and 10 illumination lamps.
Sources: Yokogawa datasheet CMZ900, checked 05.10.2026
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