TOKYO KEIKI Magnetic Compass
Tokyo Keiki
New product
TOKYO KEIKI Magnetic Compass | Marine Magnetic Compass for Ships | Navigation Compass, Binnacle, Spare Parts, Calibration & Repair | SM MARINE SERVICE™
The TOKYO KEIKI Magnetic Compass is one of the most respected magnetic navigation compasses used on merchant ships, offshore vessels, naval ships, research vessels, and passenger ships worldwide. Manufactured in Japan by TOKYO KEIKI Inc., this compass is designed to provide accurate heading information without requiring any electrical power, making it one of the most dependable navigation instruments available.
Unlike electronic navigation systems, a magnetic compass continues to operate even during complete electrical failures. For this reason, international maritime regulations continue to require a properly installed and calibrated magnetic compass as an independent heading reference on many SOLAS-compliant vessels.
For decades, ship owners and marine engineers have relied on TOKYO KEIKI magnetic compasses because of their exceptional accuracy, durable construction, long service life, and straightforward maintenance.
SM MARINE SERVICE™ supports ship owners, technical superintendents, marine engineers, and purchasing departments by supplying new, used, and professionally reconditioned TOKYO KEIKI Magnetic Compasses, genuine spare parts, repair services, calibration support, and worldwide sourcing solutions.
A TOKYO KEIKI Magnetic Compass is a precision marine navigation instrument that determines the ship's heading by aligning its magnetized compass card with the Earth's natural magnetic field. Since it requires no external power source, it serves as an independent and highly reliable backup to electronic navigation systems such as gyrocompasses, GPS, and ECDIS.
The compass is housed inside a liquid-filled bowl that dampens vibration and provides smooth movement even in rough sea conditions. A gimbal suspension keeps the compass level while the vessel rolls and pitches, ensuring stable and accurate heading readings. Corrector magnets and a Flinders bar are installed during compass adjustment to minimize magnetic deviation caused by the ship's steel structure and onboard equipment.
Because of its simplicity and proven reliability, the TOKYO KEIKI Magnetic Compass remains an essential part of modern ship bridge equipment despite the advancement of digital navigation technologies.
| Item | Details |
|---|---|
| Manufacturer | TOKYO KEIKI Inc. |
| Country of Origin | Japan |
| Product Type | Marine Magnetic Compass |
| Primary Function | Ship Heading Reference |
| Installation | Bridge Binnacle / Monkey Island |
| Power Supply | Not Required |
| Marine Standards | IMO & SOLAS Compliant (installation and adjustment as applicable) |
| Typical Vessel Types | Tankers, Bulk Carriers, Container Ships, Offshore Vessels, Passenger Ships, Naval Ships |
The TOKYO KEIKI Magnetic Compass has earned an excellent reputation in the marine industry because of its precision engineering, robust construction, and dependable performance under all sea conditions. Designed to meet the demanding requirements of commercial shipping, it remains a trusted navigation instrument on thousands of vessels worldwide.
Marine professionals appreciate the TOKYO KEIKI Magnetic Compass because it provides dependable heading information without relying on any electronic components, software, or external power source.
A marine magnetic compass consists of several precision-engineered components working together to provide accurate heading information.
The compass bowl contains the compass card and damping liquid. It protects the internal mechanism while ensuring smooth movement of the floating compass assembly.
The compass card displays the vessel's heading in degrees. It is permanently magnetized and aligns naturally with the Earth's magnetic field.
A special transparent damping fluid reduces oscillation caused by ship motion, allowing the compass card to settle quickly for stable readings.
The gimbal suspension keeps the compass bowl level even when the vessel experiences rolling or pitching, improving heading accuracy in heavy seas.
The lubber line is the fixed reference mark that indicates the vessel's heading by aligning with the compass card graduations.
The binnacle is the protective housing that securely supports the magnetic compass. It also accommodates the corrector magnets and illumination system.
Corrector magnets are installed inside the binnacle during compass adjustment to compensate for magnetic deviation caused by the vessel's steel structure and onboard electrical equipment.
The Flinders Bar is a vertical soft-iron corrector that minimizes deviation caused by changes in the Earth's vertical magnetic field at different latitudes.
The heeling magnet compensates for heading errors created when the vessel heels or rolls under varying loading conditions.
The built-in illumination system enables navigators to read the compass accurately during nighttime operations without affecting night vision.
Specifications may vary slightly depending on the model and vessel application.
| Specification | Details |
|---|---|
| Manufacturer | TOKYO KEIKI Inc. |
| Country of Manufacture | Japan |
| Product Type | Marine Magnetic Compass |
| Compass System | Liquid-Filled Magnetic Compass |
| Installation Location | Ship Bridge / Monkey Island |
| Mounting Type | Marine Binnacle |
| Heading Reference | Earth's Magnetic Field |
| External Power | Not Required |
| Illumination | Integrated Marine Compass Lamp |
| Suspension | Precision Gimbal System |
| Correction Method | Corrector Magnets, Flinders Bar & Heeling Magnet |
| Marine Standards | IMO / SOLAS Installation Requirements |
| Typical Service Life | Many years with proper maintenance |
The operating principle of the TOKYO KEIKI Magnetic Compass is based on the Earth's magnetic field. The magnetized compass card naturally aligns itself with magnetic north while floating freely inside the liquid-filled bowl. As the vessel changes course, the compass card rotates until it reaches a new equilibrium aligned with the Earth's magnetic field.
The navigator reads the vessel's heading by observing the compass card against the fixed lubber line. During installation and periodic compass adjustment, certified technicians use corrector magnets, a Flinders bar, and a heeling magnet to minimize deviation caused by the ship's own magnetic influence.
Because the compass functions entirely through magnetism and mechanical design, it continues to provide reliable heading information even if the vessel experiences a total electrical blackout, making it one of the most important emergency navigation instruments carried on board.
The TOKYO KEIKI Magnetic Compass is an essential navigation instrument installed on virtually every class of commercial and government vessel. Even with the widespread adoption of ECDIS, GPS, GNSS, and Gyro Compass systems, the magnetic compass remains a mandatory and trusted backup heading reference.
Because it operates independently of electrical systems, the TOKYO KEIKI Magnetic Compass continues to provide reliable heading information during emergencies, blackouts, or gyro compass failures.
SM MARINE SERVICE™ supplies magnetic compasses and navigation equipment to ship owners, fleet operators, and marine service companies worldwide.
A magnetic compass is affected by the vessel's own magnetic field. Steel hulls, electrical equipment, generators, motors, and cargo can all introduce magnetic deviation, which must be corrected to ensure safe navigation.
Regular compass calibration ensures accurate navigation and satisfies port state control and classification society inspections.
| Problem | Possible Cause | Recommended Solution |
|---|---|---|
| Compass card moves slowly | Aged or contaminated compass fluid | Replace fluid and inspect bowl |
| Air bubbles inside bowl | Fluid leakage or temperature variation | Refill or overhaul compass bowl |
| Incorrect heading | Magnetic deviation | Perform compass adjustment and calibration |
| Compass card sticking | Internal contamination or worn pivot | Clean and replace damaged components |
| Poor night visibility | Defective illumination lamp | Replace lighting unit |
| Liquid leakage | Damaged seals or cracked bowl | Replace seals or bowl assembly |
| Excessive vibration | Loose mounting or damaged gimbal | Inspect and tighten mounting hardware |
| Reading instability | Damaged gimbal suspension | Repair or replace gimbal assembly |
Early diagnosis and proper maintenance significantly extend the service life of the compass and improve navigational safety.
Routine maintenance is essential for preserving the accuracy and longevity of a marine magnetic compass.
Proper preventive maintenance minimizes unexpected failures and ensures reliable heading information throughout the vessel's service life.
Even in today's era of highly advanced electronic navigation systems, the magnetic compass remains indispensable because it offers several unique advantages:
Its simplicity, reliability, and regulatory importance make the magnetic compass one of the most valuable navigation instruments on board any ship.
It provides an accurate magnetic heading reference for safe navigation and serves as an independent backup to electronic navigation systems.
No. The compass operates solely using the Earth's magnetic field and does not require any external electrical supply.
Calibration corrects magnetic deviation caused by the ship's structure and onboard equipment, ensuring accurate heading information.
Routine visual inspections should be performed regularly, with professional adjustment and verification carried out whenever significant magnetic changes occur or as required by regulations.
Yes. We supply complete units, spare parts, replacement accessories, and sourcing support for many TOKYO KEIKI marine navigation products.
The TOKYO KEIKI Magnetic Compass is a high-quality Japanese marine navigation instrument designed to provide accurate and dependable heading information for commercial ships and offshore vessels. Its power-independent operation, precision engineering, and long service life make it one of the most trusted magnetic compasses in the maritime industry. Suitable for new installations, retrofits, repairs, and spare parts support, it remains an essential component of every professional ship bridge.
For installation instructions, operation manuals, and technical documentation, consult the official TOKYO KEIKI marine navigation manuals supplied with the equipment or obtain the appropriate model-specific documentation through authorized marine service providers. Always use the manual that matches the exact compass model installed on the vessel.
The TOKYO KEIKI Magnetic Compass continues to be one of the most dependable navigation instruments in the global maritime industry. While modern ships rely heavily on advanced electronic navigation systems, a properly maintained magnetic compass remains the ultimate independent heading reference during emergencies and power failures.
Its robust construction, exceptional reliability, minimal maintenance requirements, and compliance with international maritime standards have made it the preferred choice for ship owners, operators, and marine engineers worldwide.
Whether your vessel requires a complete compass assembly, replacement spare parts, professional inspection, calibration support, or technical sourcing assistance, selecting genuine and properly maintained equipment is essential for safe and efficient navigation.
SM MARINE SERVICE™ is a trusted global supplier of marine automation, navigation, engine room, fire & safety, hydraulic, and control system equipment.
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