Product overview
The Tokyo Keiki TG‑8000 is a marine gyrocompass system designed to provide accurate true-heading data to a vessel’s bridge and connected navigation equipment.
The system consists primarily of a TG‑8000 master compass and a corresponding control/interface unit. It was widely installed aboard IMO-regulated commercial vessels and remains important in the marine repair, spare-parts and retrofit market.
Technical specifications
| Specification | Details |
|---|---|
| Manufacturer | Tokyo Keiki Inc., formerly Tokimec |
| Country of origin | Japan |
| Model | TG‑8000 |
| Product type | Marine gyrocompass system |
| Vessel application | IMO-regulated commercial vessels |
| System configurations | TG‑8000‑S single-gyro or TG‑8000‑D dual-gyro system |
| Main components | Master compass and control/interface unit |
| Heading accuracy | Approximately ±0.3°, subject to operating conditions |
| Maximum follow-up rate | 75° per second |
| Heading output | Serial and repeater outputs |
| Serial interface | IEC 61162-1/2; configuration-dependent |
| Input power | AC 100–220 V and 24 VDC backup, depending on installation |
| Automatic correction | Latitude and speed-error correction |
| Operating temperature | Approximately −10°C to +50°C |
| Applicable standard | IMO Resolution A.424(XI) and ISO 8728 |
| Current status | Legacy/end-of-life model; installed-base support continues |
The original TG‑8000 brochure identifies the model for standard IMO ship applications and confirms its fast follow-up rate and IEC 61162-2 serial output. Tokyo Keiki TG‑8000/8500 brochure
Main features
- Accurate true-heading reference
- Compact two-unit configuration
- Automatic speed-error correction
- Automatic latitude correction
- Rapid 75°/second follow-up
- Fast serial heading-data output
- Multiple repeater and navigation-equipment outputs
- External heading-sensor interface
- Startup timer
- Single- and dual-gyro configurations
- Proven installation aboard commercial vessels
Connected marine equipment
The TG‑8000 can provide heading information to:
- Autopilot and heading-control systems
- Radar and ARPA
- ECDIS
- AIS
- Voyage data recorder
- Heading repeaters
- Satellite-navigation systems
- Dynamic-positioning equipment
- Bridge alarm and monitoring systems
- Steering-control equipment
Operating principle
The master compass uses a rapidly rotating gyroscope whose axis stabilizes relative to true north. The control unit processes the gyro signal and applies corrections for the vessel’s latitude, speed and movement.
The corrected true-heading information is then distributed to the vessel’s navigation and steering systems.
