When the master unit detects a subsystem failure, it triggers an audible alarm and flashes an alphanumeric error code on the control display. Use this lookup guide extracted from the standard maintenance manual: E-01 : Follow-Up System Failure
Features one gyrocompass unit. Ideal for standard merchant vessels requiring reliable, compliant heading data. Yokogawa Gyro Compass Cmz 900 Manual
If you are currently troubleshooting an issue or planning a service on your vessel, I can provide more specific guidance. Please let me know: When the master unit detects a subsystem failure,