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The Sperry Marine NAVIGAT 3500 Fiber Optic Gyro Compass is a networked fibre-optic gyrocompass and Motion Reference Unit (MRU) designed to provide accurate vessel heading and motion data. It uses solid-state fibre-optic gyroscope technology with no moving parts, reducing maintenance requirements and improving long-term reliability.
Integrated with Sperry Marine’s CompassNet heading management system, it provides heading, rate of turn (ROT), roll, pitch, heave and horizontal angular-rate data. It supports integration with navigation displays, heading repeaters, autopilots and other compatible bridge equipment. It is suitable for commercial vessels, tankers, LNG carriers, offshore support vessels and high-speed craft.
| Specification | Details |
|---|---|
| Make | Sperry Marine |
| Model | NAVIGAT 3500 |
| Product Name | Fiber Optic Gyro Compass |
| Equipment Type | Networked Gyrocompass and Motion Reference Unit (MRU) |
| Technology | Fibre-optic gyroscope (FOG), solid-state strap-down |
| Heading Accuracy | ≤ 0.15° × secant latitude (RMS) |
| Roll and Pitch Accuracy | 0.1° RMS (manufacturer brochure value) |
| Roll and Pitch Accuracy with GNSS | ≤ 0.02° RMS (under specified conditions) |
| Rate of Turn Accuracy | ≤ 0.06°/min |
| Heave Accuracy | 0.1 m or 10%, whichever is higher |
| Horizontal Angular-Rate Accuracy | ≤ 0.06°/min |
| Initial Settling Time | 5 minutes |
| Fine Settling Time | Up to an additional 25 minutes |
| Heading Range | 0°–360° |
| Roll Range | −180° to +180° |
| Pitch Range | −90° to +90° |
| Operating Temperature | −20°C to +55°C |
| Storage Temperature | −40°C to +80°C |
| Power Supply | 24 V DC main and backup |
| Mean Time Between Failures (MTBF) | 150,000 hours |
| Sensor Output | Serial interface, IEC 61162-1/2 |
| Sensor Data Outputs | Multiple configurable serial outputs via CompassNet |
| Repeater Interfaces | 8 repeater ports, including serial data and power |
| Serial Inputs | 8 inputs for GNSS, speed log, rudder angle and set heading |
| Analogue Output | ±10 V rate-of-turn output |
| INS Interface | Bidirectional INS-compliant interface |
| Magnetic Compass Input | Fluxgate or serial input, depending on configuration |
| Alarm Interfaces | Serial alerts and dry-contact outputs |
| Heading Management System | CompassNet |
| User Interface | NAVITWIN V Control and Display Unit (CDU) |
| Approval | DNV MED type approval listed by manufacturer; verify applicable certificate |
| Maintenance | No routine sensor maintenance or calibration required, according to manufacturer |
| Application | Commercial shipping, offshore vessels, passenger vessels and high-speed craft |
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