A redundant system with two master compasses, suitable for high-specification vessels where heading failure is not an option.

The Yokogawa Gyro Compass CMZ 900 is a high-performance gyro compass designed to provide accurate and reliable directional data to ships and vessels. The system consists of a gyrocompass, a repeater, and a control unit. The gyrocompass is the primary sensor that detects the Earth's rotation and provides directional data, while the repeater displays the directional information to the user. The control unit manages the system and provides interfaces for data output and input.

For the navigating officer, the "Start-up" and "Stop" procedures outlined in the manual are critical. A gyro compass relies on a spinning wheel and the laws of physics—specifically the gyroscopic inertia and the precession caused by earth’s rotation—to settle on true north. The manual details the necessary settling time (typically a few hours) required for the compass to stabilize. Ignorance of these parameters can lead to a false heading indication, a scenario that could prove catastrophic in restricted visibility or congested waters. Furthermore, the manual outlines the alarms and error indicators specific to the CMZ 900, enabling the officer to distinguish between a minor signal disruption and a critical system failure.

Yokogawa CMZ 900 series is a high-precision, modular gyrocompass system designed for marine navigation. It is type-approved according to IMO standards