Sperry Marine NAVITWIN IV 4994 Heading Management System (Gyro Compass Switchover Unit)
Product Overview
The Sperry Marine NAVITWIN IV 4994 Heading Management System is an advanced gyro compass switchover and heading management unit designed to monitor, control, and distribute heading information from multiple gyro compasses and magnetic compass sensors. It automatically selects the optimal heading source and provides reliable heading data to radar, ECDIS, autopilot, AIS, VDR, compass repeaters, and integrated bridge systems. Professionally tested and reconditioned units are available from WAVETECH MARITIME.
- Genuine Sperry Marine navigation equipment
- Model NAVITWIN IV 4994
- Heading Management System
- Gyro Compass Switchover Unit
The Sperry Marine NAVITWIN IV 4994 Heading Management System is a professional marine navigation control unit designed to manage, monitor, and distribute heading information from multiple onboard heading sensors. As the central heading management and gyro compass switchover unit, it continuously supervises connected gyro compasses and magnetic compass inputs, automatically selecting the most reliable heading source for safe vessel navigation.
The system supports up to three true heading sources and one magnetic compass, allowing operators to manually or automatically select the active heading reference. In the event of gyro failure, excessive heading deviation, or sensor malfunction, NAVITWIN IV automatically switches to an alternative heading source, ensuring uninterrupted heading information for critical bridge equipment.
Designed for modern integrated bridge systems, the NAVITWIN IV distributes heading information to:
- Radar Systems
- ECDIS
- Autopilot Systems
- AIS
- Voyage Data Recorder (VDR)
- Compass Repeaters
- Steering Control Systems
- Integrated Bridge Systems (IBS)
The unit also incorporates advanced monitoring functions including:
- Automatic Gyro Compass Switchover
- Heading Difference Alarm
- Off-Heading Alarm
- Central Gyro Compass Control
- Magnetic Heading Processing
- Heading Reference Distribution
- System Alarm Monitoring
- Watch Alarm Reset Interface
These functions help maintain safe navigation while reducing operator workload and improving bridge reliability.
The NAVITWIN IV 4994 is widely installed aboard cargo ships, container vessels, bulk carriers, oil and chemical tankers, LNG/LPG carriers, offshore support vessels, passenger ships, and naval vessels using Sperry Marine gyro compass systems.
At WAVETECH MARITIME, we supply used, reconditioned, and fully tested Sperry Marine NAVITWIN IV 4994 Heading Management Systems sourced from commercial vessels. Every unit is professionally inspected and functionally tested before shipment. Worldwide shipping and technical support are available for shipowners, ship managers, shipyards, and marine service companies.
Key Features
- Genuine Sperry Marine navigation equipment
- Model NAVITWIN IV 4994
- Heading Management System
- Gyro Compass Switchover Unit
- Supports up to 3 gyro compass inputs
- Supports 1 magnetic compass input
- Automatic heading source selection
- Manual heading source selection
- Heading Difference Monitoring
- Off-Heading Alarm Function
- Automatic gyro switchover on heading failure
- Central gyro compass control unit
- NMEA 0183 / IEC 61162 serial outputs
- RS-422 communication interfaces
- Heading distribution to radar, ECDIS, AIS, autopilot and VDR
- Compass repeater interface
- Integrated bridge system compatibility
- 18–36 VDC power supply
- Rugged marine-grade construction
- Ideal for retrofit and replacement projects
- Professionally tested before dispatch
- Worldwide shipping available
- Brand: SPERRY MARINE
- Model: SPM-NAVITWINIV-4994
- Condition: Used
- Application:
- Commercial Cargo Ships
- Container Vessels
- Bulk Carriers
- Oil & Chemical Tankers
- LNG & LPG Carriers
- Offshore Support Vessels (OSV)
- Passenger & Cruise Ships
- Naval & Coast Guard Vessels
- Integrated Bridge Systems (IBS)
- Gyro Compass Systems
- Compass Repeaters
- Radar Systems
- ECDIS Systems
- Autopilot Systems
- AIS Systems
- Voyage Data Recorder (VDR)
- Ship Retrofit & Modernization Projects
- Marine Navigation Equipment Replacement
- Availability: Subject to stock confirmation
