A gyrocompass detects the direction of true north by means of a fast-spinning rotor, which is suspended with no friction and is influenced by gravity and rotation of the Earth. A gyrocompass consequently indicates a ship's heading. The ship's heading is transmitted to repeater compasses and other ship's equipment after the signal format is converted to serial data or to stepper or analog signals depending on what type of format the equipment requires.
There are three models in the CMZ900 series, latest generation of mercury-free:
- CMZ900B: Single-unit model, suitable for small vessels
- CMZ900S: Single-unit model, suitable for all types of merchant vessels
- CMZ900D: Dual-unit model for extra reliability
CMZ900 series facilitates easy construction of customized systems. Improved vibration- and shock-proof mechanism, realized by adopting a universal joint and an outer bellows damper in addition to the rubber isolator and the existing bellows damper.
With the reduced size and weight of the container and the improved followup speed, the gyrocompass allows repeater compasses to keep smooth, synchronous track of it even in the case of fast-turning small vessels.
The master compass and control box of the CMZ900S can be installed in the autopilotstand. The restart time of the CMZ700 series can be set from 1 to 99 hours.
Setting Time and Accuracy Setting Time Within 5 hours (Operational state is reached in about 2 hours)
Accuracy Static within ±0.25 deg.x (1/cos latitude)
Dynamic within ±0.75 deg.x (1/cos latitude)
Followup accuracy Within 0.1 deg. or less
Maximum followup speed Max. 30 deg./s
Permissible acceleration 0.5G 0.5s or less
Environmental Parameters Mechanical freedom Max. permissible roll angle: ±40 deg.
Max. permissible pitch angle: ±40 deg.
Operating temperature -10 deg.C to +55 deg.C
Power Supply Mains 24V DC AC (option):
AC adapter type MKR027 required 100V/110V/115V/220V AC 50/60Hz single-phase
Alarm 24 V DC
Input Signal External heading signal IEC61162-1 (NMEA0183) 1 circuit
Options (made available by adding the MKR024 C operation unit)
Automatic speed error correction Options
Latitude signal IEC61162-1 (NMEA0183) 1 circuit
Speed signal 200 P/nm or IEC61162-1 (NMEA0183) 1 circuit
External heading signal
(for deviation alarm detection) IEC61162-1 (NMEA0183)
(supplied to the MKR024 C operation unit) 1 circuit
Output Signal Repeater compass drive signal 3 circuits
Step heading signal 1 circuit
Serial signal: IEC61162-1 (NMEA0183) 3 circuits
Gyro. running signal (close contact for running) 1 circuit
Alarm (Open contact for failure or no voltage)
System failure 1 circuit
No voltage 1 circuit