Rate of Turn Indicator
medium
4 models total
IMO-required rate of turn indicator for vessels in restricted waters. Mandatory for vessels ≥50000 GT or specific flag requirements.
4 manufacturers · 4 models
Raytheon Anschütz
1
ROT Indicator
±30°/min
· Navigation Data / Sensor
· digital rate-of-turn indicator
Range
±30°/min
IMO Approved
ja
Common Failures & Inspection Points
- Gyro sensor drift
- Display calibration
- Interface issues
Service: Part of Synapsis bridge. Also available standalone.
Spare Parts: Raytheon Anschütz: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Strengths
- Integrated with Synapsis bridge suite for seamless data exchange
- IMO approved, meeting SOLAS performance requirements
- High resolution within ±30°/min range and fast response
- Standalone option simplifies retrofits on older vessels
- Solid‑state gyro reduces mechanical wear
Weaknesses
- Gyro sensor can drift, requiring periodic recalibration
- Display calibration may shift over time, affecting accuracy
- Interface compatibility issues with non‑Anschütz bridge systems
- Higher upfront cost compared to basic analog ROT indicators
- Requires proprietary software updates for firmware
Typical Vessels:
ContainerBulk CarrierTankerCruise ShipOffshore Supply Vessel
Decision Guide: Choose if you need a modern, IMO‑approved digital rate‑of‑turn display that integrates directly with the Raytheon Anschütz Synapsis bridge system or you want a standalone unit for retrofit. Avoid if you operate on a tight budget, rely on legacy analog equipment, or require guaranteed compatibility with non‑Anschütz bridge consoles.
Use Cases: Used on vessels during maneuvering operations such as docking, dynamic positioning, and compliance monitoring under SOLAS; commonly installed on new builds and major retrofits where the Synapsis bridge suite is specified.
Sperry Marine
1
ROT Indicator
±30°/min
· Navigation Data / Sensor
· Electronic rate‑of‑turn sensor
Range
±30°/min
IMO Approved
ja
Common Failures & Inspection Points
- Sensor aging
- Display backlight
- Mounting vibration
Service: Sperry ROT indicator. Part of VisionMaster suite.
Spare Parts: Sperry Marine: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Strengths
- IMO approved and fully compatible with the VisionMaster navigation suite
- Wide measurement range of ±30°/min suitable for most commercial vessels
- Compact electronic design with a clear digital display for quick situational awareness
- Simple integration with existing bridge consoles and autopilot systems
Weaknesses
- Sensor performance can degrade over time (aging) requiring periodic recalibration or replacement
- Display backlight may dim or fail, affecting readability in low‑light conditions
- Vibration from mounting points can affect accuracy if not properly isolated
Typical Vessels:
TankerContainer shipBulk carrierGeneral cargo vesselPassenger ferry
Decision Guide: Choose if: you already use the VisionMaster suite, need an IMO‑approved ROT indicator with a standard ±30°/min range, and value tight integration with bridge displays. Avoid if: budget constraints demand a lower‑cost standalone unit, or you require higher precision beyond the standard range for specialized maneuvering vessels.
Use Cases: Deployed on the navigation bridge to give helmsmen and officers immediate feedback on turning rate during course changes, docking maneuvers, and compliance checks with COLREGs; also feeds data to autopilot and dynamic positioning systems for enhanced control.
Tokyo Keiki
1
ROT Indicator
±30°/min
· Navigation Data / Sensor
· Electronic Rate of Turn indicator
Range
±30°/min
IMO Approved
ja
Common Failures & Inspection Points
- Sensor calibration
- Display dimming
- Interface compatibility
Service: Japanese ROT indicator. Reliable operation.
Spare Parts: Tokyo Keiki: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Strengths
- IMO approved, meeting mandatory performance standards
- Compact Japanese design known for mechanical reliability
- Clear analog/digital display within a ±30°/min range
- Simple wiring interface compatible with most legacy bridge consoles
Weaknesses
- Sensor calibration can drift and requires periodic verification
- Display brightness may dim under low‑light conditions
- Limited integration options; newer NMEA 2000 or Ethernet interfaces are not standard
- Turn‑rate range capped at ±30°/min, unsuitable for high‑maneuverability craft
Typical Vessels:
TankerContainer shipBulk carrierPassenger ferryOffshore supply vessel
Certifications:
IMO Approved
Decision Guide: Choose if you need a proven, IMO‑approved ROT indicator with straightforward installation on conventional bridge systems and value Japanese build quality. Avoid if your vessel requires extended turn‑rate limits, advanced digital networking (e.g., NMEA 2000), or a fully integrated bridge management suite.
Use Cases: Installed on the main bridge console of merchant vessels to monitor turning performance during course changes, comply with COLREGs, and provide feedback to autopilot systems for safe maneuvering.
Yokogawa
1
ROT Indicator
±30°/min
· Navigation Data / Sensor
· gyro-based ROT
Range
±30°/min
Common Failures & Inspection Points
- Yokogawa marine exit — spares limited
- Sensor drift
- Display obsolescence
Service: Yokogawa ROT. Spares via third parties only.
Spare Parts: Yokogawa: Ersatzteile per Hersteller-Netzwerk. Lead time: 1-4 Wochen. Backup-Systeme an Bord pflichtgemäß.
Strengths
- Compact design fits standard bridge consoles
- Direct integration with other Yokogawa bridge systems
- Proven reliability in long‑service marine environments
- Simple analog/digital display for quick crew interpretation
Weaknesses
- Spare parts are limited and only available through third parties
- Sensor drift can develop over time, requiring periodic recalibration
- Display technology may become obsolete compared with newer digital units
- Limited advanced networking features versus modern integrated bridge suites
Typical Vessels:
TankerContainer shipBulk carrierGeneral cargo vesselCruise ship
Decision Guide: Choose if the vessel already uses Yokogawa bridge equipment, needs a straightforward and proven ROT display, and can manage third‑party spare logistics. Avoid if you require extensive future support, advanced data networking, or the latest digital display technology.
Use Cases: Installed on the navigation bridge of merchant vessels to provide real‑time turn rate information for manual steering, autopilot feedback, and compliance with maneuvering regulations such as IMO COLREGs.