Gyrocompass
medium
SOLAS-mandatory heading reference for vessels ≥500 GT. Fiber Optic Gyro (FOG) and Spinning Mass technologies.
Known Models (13)
CDL MiniGyro FOG
Compact FOG
· Navigation Data / Sensor
technology: Fiber Optic Gyro
accuracy: 0.1°
Common Failures:
- • Limited to smaller vessels
- • Vibration sensitivity
- • Interface limitations
Service: Compact FOG for ROV and small craft. Not SOLAS-grade.
Spares: CDL: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Kongsberg Seatex Seapath
GNSS/IMU hybrid
· Navigation Data / Sensor
technology: GNSS + IMU
heading_accuracy: 0.02°
Common Failures:
- • GNSS antenna failures
- • IMU calibration drift
- • Complex configuration
Service: Standard for DP vessels. Combines GNSS and motion sensing.
Spares: Kongsberg: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Raytheon Anschütz Standard 20
Spinning mass gyro
· Navigation Data / Sensor
technology: Spinning Mass
settling_time: 3-5 hrs
accuracy: 0.5° secant lat
imo_approved: True
Common Failures:
- • Rotor bearing wear after 40,000+ hrs
- • Fluid level check required
- • Follow-up motor aging
Service: Traditional spinning mass. Requires periodic bearing and fluid checks.
Spares: Raytheon Anschütz: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Raytheon Anschütz Horizon FOG
FOG gyro
· Navigation Data / Sensor
technology: Fiber Optic Gyro
settling_time: 20 min
accuracy: 0.05° secant lat
imo_approved: True
Common Failures:
- • High replacement cost
- • Firmware dependency on Synapsis
- • Rare failures
Service: Premium FOG. Extremely low drift. 20+ year lifespan expected.
Spares: Raytheon Anschütz: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Raytheon Anschütz Standard 4
FOG gyro compact
· Navigation Data / Sensor
technology: Fiber Optic Gyro
settling_time: 30 min
accuracy: 0.25° secant lat
Common Failures:
- • Limited accuracy vs Standard 22
- • Power supply sensitivity
- • Mounting vibration
Service: Compact FOG for workboats and small commercial vessels.
Spares: Raytheon Anschütz: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Safran Phins
IMU/FOG hybrid
· Navigation Data / Sensor
technology: FOG IMU
settling_time: 10 min
accuracy: 0.01°
Common Failures:
- • Very high cost
- • Alignment procedure complexity
- • Export control restrictions
Service: Military-grade IMU. Used on DP vessels and naval ships.
Spares: Safran: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Sperry Marine MK 39 MOD
Digital spinning mass
· Navigation Data / Sensor
technology: Digital Spinning Mass
settling_time: 3-5 hrs
imo_approved: True
Common Failures:
- • Same rotor issues as MK 37
- • MOD-specific board failures
- • Interface protocol incompatibility
Service: Enhanced version. NMEA and synchro outputs.
Spares: Sperry Marine: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Sperry Marine NAVIGAT 2100
FOG gyro
· Navigation Data / Sensor
technology: Fiber Optic Gyro
settling_time: 30 min
imo_approved: True
Common Failures:
- • Service availability
- • Interface protocol issues
- • Spares sourcing
Service: Sperry Marine FOG. Part of VisionMaster bridge.
Spares: Sperry Marine: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Teledyne TSS Meridian Gyro
FOG survey
· Navigation Data / Sensor
technology: Fiber Optic Gyro
accuracy: 0.01°
Common Failures:
- • High cost
- • Survey-specific calibration
- • Connector issues subsea
Service: Used in hydrographic survey. Very high accuracy.
Spares: Teledyne TSS: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Tokyo Keiki TG-6000
Spinning mass gyro
· Navigation Data / Sensor
technology: Spinning Mass
settling_time: 4-6 hrs
imo_approved: True
Common Failures:
- • Rotor bearing wear
- • Mercury ballistic damping fluid leaks (older units)
- • Gimbals friction
Service: Traditional gyro. Mercury-free version available. Service every 4 years.
Spares: Tokyo Keiki: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Tokyo Keiki ES-41
Gyro follow-up
· Navigation Data / Sensor
technology: Gyro repeater
Common Failures:
- • Follow-up motor wear
- • Synchro signal issues
- • Display card backlighting
Service: Gyro repeater for steering stand. Essential for helmsman.
Spares: Tokyo Keiki: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Yokogawa CMZ-900
Spinning mass
· Navigation Data / Sensor
technology: Spinning Mass
settling_time: 4-6 hrs
imo_approved: True
Common Failures:
- • Bearing wear
- • Fluid check required
- • Limited global service
Service: Yokogawa exited marine market — spares via third parties.
Spares: Yokogawa: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
iXblue Octans
FOG MRU/Gyro
· Navigation Data / Sensor
technology: Fiber Optic Gyro
accuracy: 0.01°
Common Failures:
- • High cost
- • Subsea connector issues
- • Firmware update procedure
Service: Used for ROV, DP and hydrographic survey. High accuracy.
Spares: iXblue: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.