Sperry Marine NAVIGAT X MK 2
Sperry
New product
| Specification | Details |
|---|---|
| Manufacturer | Sperry Marine |
| Historical association | Northrop Grumman Sperry Marine |
| Model | NAVIGAT X MK 2 |
| Product type | Digital marine gyrocompass |
| Type designation | Type 4991, according to published manual references |
| Stock number | 74799, according to published manual references |
| Power supply | Two independent 24 VDC inputs |
| Main function | True heading and rate-of-turn data |
| Display | Integrated control and display panel |
| Service interval | 18 months, according to supplied information |
| Country of origin | Verify from the individual unit nameplate |
Identification note: Confirm the model, stock number, serial number and component markings before ordering replacement equipment.
The Sperry Marine NAVIGAT X MK 2 Digital Gyrocompass is a compact marine navigation system that provides true-heading information corrected for north-speed error and rate-of-turn data. It supplies heading information to compatible shipboard systems, including autopilots, radar, ECDIS, AIS, VDR and compass repeaters, depending on the installed configuration.
The unit integrates gyroscopic components, electronic processing, a display and operator controls. It is designed for marine navigation installations where reliable heading information is essential.
Spinning-mass gyrocompass with twin rotors operating at approximately 19,000 rpm.
Liquid-damped gyroscopic system.
Dual 24 VDC power inputs.
Integrated front-panel display and controls.
True-heading and rate-of-turn outputs.
Support for up to four analogue repeaters in the documented configuration.
Multiple serial data outputs.
Six-steps-per-degree step-repeater output.
Monitoring of supply voltages, gyrosphere current and follow-up system.
Storage of operating data, including current, temperature and operating time.
Designed to remain north-stabilized for up to three minutes during a power interruption, according to supplied specifications.
The front panel includes an LCD display and the following controls:
F1/Menu
F2 and F3
Shift
Reset/Dim−
Enter/Dim+
The supplied unit information includes a service label stating “Service – 18 month intervals.” Stickers reportedly identify “Container Mod 10/3 (-22561)” and “Gyrosphere /3 (-74829).” Record these markings when requesting spare parts, but verify their ordering significance before purchase.
After a cold start, settling may take up to three hours. Follow the vessel's operating procedures before relying on the heading output.
| Parameter | Specification |
|---|---|
| Power supply | Two independent 24 VDC inputs |
| Published supply range | 18–36 VDC |
| Start-up consumption | Approximately 80 W |
| Operating consumption | Approximately 45 W |
| Repeater power | Approximately 8 W per analogue repeater |
| Rotor speed | Approximately 19,000 rpm |
| Static accuracy | Less than 0.1° × secant latitude |
| Dynamic accuracy | Less than 0.4° × secant latitude |
| Settle-point error | Less than 0.1° × secant latitude |
| Settling time | Less than 3 hours under specified conditions |
| Follow-up speed | 100°/second |
| Roll and pitch freedom | ±40°, according to supplied information |
| MTBF | More than 40,000 hours, as published |
| Analogue repeater outputs | Up to 4 |
| Step-repeater output | One 6-steps-per-degree output |
| Approximate dimensions | 404 × 520 × 420 mm |
| Approximate weight | 21 kg |
Confirm the installed configuration and applicable manual before using these figures for installation or commissioning.
Important components and interfaces may include:
Gyrosphere assembly: Provides the gyroscopic reference.
Gyro container: Houses and supports the gyrosphere.
Main PCB and electronic processing: Processes signals and controls system functions.
Display and control panel: Provides heading display and operator access.
Follow-up system and shaft encoder: Support heading alignment and data transmission.
DC inputs: Accept the independent power supplies.
Serial interfaces: Distribute heading and related data.
Repeater outputs: Support compatible analogue and step repeaters.
Cables and connectors: Carry power and data signals.
Internal PCB and component part numbers must be confirmed from the actual labels or correct parts documentation.
The NAVIGAT X MK 2 may provide heading information to compatible:
Ship bridge navigation systems.
Autopilots and heading-control systems.
Marine radar and ECDIS.
AIS and VDR installations, where configured.
Analogue and serial compass repeaters.
Heading distribution and monitoring equipment.
Compatibility depends on output format, wiring, configuration and the requirements of the connected equipment.
| Symptom | Initial checks |
|---|---|
| No power or display | Check both DC supplies, protective devices, polarity and connections. |
| Heading unavailable | Review system status, power stability and settling condition. |
| Incorrect heading | Allow the required settling time and verify authorized alignment settings. |
| Gyro does not settle | Check documented status indications and follow the applicable manual. |
| No heading at radar or ECDIS | Check the output port, wiring, signal format and receiving-device settings. |
| Incorrect repeater reading | Verify repeater compatibility, wiring and output configuration. |
| Intermittent operation | Inspect power stability, terminals, cables and connectors. |
| Alarm or suspected gyrosphere fault | Record the exact indication and arrange qualified service inspection. |
Record displayed status and fault messages before resetting the unit.
Check power and external wiring using approved procedures.
Verify communication settings at both ends of each data link.
Do not change alignment or calibration without authorization.
If heading data is unreliable, inform the responsible bridge officer and follow vessel navigation safety procedures.
Leave internal gyro and follow-up-system repairs to qualified technicians.
The system monitors conditions including supply voltages, gyrosphere current and follow-up operation. Exact alarm wording and corrective actions should be taken from the applicable manual. Do not assume an undocumented alarm code or message.
Follow the stated 18-month service interval and applicable manufacturer instructions.
Record the model, serial number and service history.
Inspect external cables, connectors, terminals and mounting arrangements.
Check both DC supply circuits.
Review operating data and status indications as instructed.
Verify heading outputs after authorized maintenance.
Record alignment settings before approved service work.
Allow for the specified settling time after a cold start.
SM MARINE SERVICE™ can assist with sourcing enquiries for:
Complete NAVIGAT X MK 2 gyrocompass units.
Gyrosphere and container assemblies.
Display and control-panel assemblies.
Main PCB and verified electronic boards.
Power-input components.
Shaft encoder and follow-up-system parts.
Serial and repeater interface components.
Cables, connectors and related accessories.
New, used, refurbished, reconditioned and tested working equipment may be available depending on sourcing results.
Ordering advice: Provide clear photographs of the nameplate, serial number, service stickers and required component. The markings “-22561” and “-74829” should be treated as identification clues until verified against the correct parts documentation.
Related product families include NAVIGAT X MK 1, NAVIGAT 2100, NAVIGAT 3000, NAVISTAR, NAVITWIN IV, NAVIPRINT and Universal Digital Repeater equipment.
These are not automatically interchangeable. Before selecting a replacement, verify power requirements, heading accuracy, data interfaces, repeater compatibility, mounting and commissioning requirements.
It is a digital marine gyrocompass that provides true-heading and rate-of-turn data for compatible navigation systems.
It is manufactured by Sperry Marine and is historically associated with Northrop Grumman Sperry Marine.
Published manual references identify Type 4991 and Stock No. 74799. Confirm these against the actual unit.
Availability of complete units and spare parts must be confirmed. Contact SM MARINE SERVICE™ for sourcing enquiries.
Availability depends on the exact part, identification markings and stock. Confirm compatibility before ordering.
Used, refurbished, reconditioned or tested working units may be available subject to sourcing and condition verification.
The supplied information states that settling may take up to three hours after a cold start.
Request the applicable operation, installation and service documentation through SM MARINE SERVICE™. Ensure the document matches the installed model and revision.
SM MARINE SERVICE™ accepts international equipment and spare-parts enquiries and can assist with shipping arrangements, subject to availability.
The Sperry Marine NAVIGAT X MK 2 is a digital marine gyrocompass providing true-heading and rate-of-turn data for compatible shipboard navigation equipment. It features dual 24 VDC inputs, an integrated display, multiple data outputs and system monitoring. Contact SM MARINE SERVICE™ for complete units, gyrosphere and container enquiries, spare parts, troubleshooting support and replacement options.
SM MARINE SERVICE™
Marine Automation & Navigation Equipment Supplier
Available Condition:
• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment
Stock Location:
• Bangladesh • China
Services:
• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing
Contact Information
SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh
Mobile / WhatsApp / Viber: +88 01818 929292
Email: info@smmarineservice.com
Website: www.smmarineservice.com
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