Gyro Sphere
Sperry Marine
Refurbished
The Sperry Marine NAVIGAT X Gyrosphere is the core north-seeking element used within applicable NAVIGAT X MK1 and NAVIGAT X MK2 gyrocompass systems.
The supplied SM MARINE SERVICE™ photograph shows a Sperry Marine NAVIGAT X gyrosphere together with its container assembly, allowing customers searching for either a complete gyro element, sphere or container-related replacement to identify the equipment easily.
Sperry Marine documentation confirms that the NAVIGAT X family uses a buoyancy-supported gyrosphere. In the MK1 system, this arrangement helps the gyro remain north-stabilized even through short interruptions in electrical power.
Manufacturer: Sperry Marine
Product: Gyrosphere / Gyro Sphere
Equipment Family: NAVIGAT X Gyrocompass
Applicable Families: NAVIGAT X MK1 / NAVIGAT X MK2, depending on gyrosphere and container version
Product Type: North-Seeking Gyro Element / Gyrocompass Sensitive Element
Application: Marine true-heading generation
Typical Supply: Gyrosphere only or gyrosphere/container assembly depending on requirement
Sperry's certification documents identify 4911 / 5000 as gyrosphere types, while various gyrosphere-and-container configurations are separately identified.
The gyrosphere is effectively the heart of a conventional spinning-mass marine gyrocompass.
Inside the NAVIGAT X MK2 gyrosphere are two mechanically linked gyroscopes. Once operating speed is reached, the resultant gyro vector and sphere settle toward true north, providing the fundamental heading reference used by the gyrocompass system.
This heading can subsequently be distributed to equipment such as:
• Radar / ARPA
• ECDIS
• Autopilot
• AIS
• VDR / S-VDR
• Steering repeaters
• Bearing repeaters
• Integrated bridge systems
The NAVIGAT X MK1 is a digital marine gyrocompass built around Sperry Marine's proven floating gyrosphere principle.
Sperry describes the gyrosphere as being supported by buoyancy, while the single-point suspension of the gyrosphere container avoids some of the disadvantages associated with conventional gimbal arrangements.
Official certification identifies NAVIGAT X MK1 system Type 4914 variants and gyrosphere Types 4911 / 5000 among approved equipment configurations.
The NAVIGAT X MK2 also uses the Sperry gyrosphere principle.
Its gyrosphere contains a twin-gyro arrangement designed to eliminate intercardinal roll error. After run-up, the gyrosphere settles toward true north and provides the system's heading reference.
Because different generations and container modifications exist, customers should provide the gyro model, gyrosphere type, container type, stock/part number and photographs before ordering.
Sperry Marine certification documentation includes references such as:
4911 / 4911 AA – Gyrosphere
5000 / 5000 AA – Gyrosphere
4991-2000 – Gyrosphere & Container Mod 10/2
4991-3000 – Gyrosphere & Container Mod 7/2
4991-4000 – Gyrosphere & Container Mod 10/3
More recent CompassNet certification also identifies additional gyrosphere/container configurations within the NAVIGAT family.
This is why part-number verification is important before replacement.
• Proven spinning-mass gyro technology
• True-north-seeking operation
• Twin-gyro arrangement in applicable systems
• Buoyancy-supported gyrosphere design
• High heading stability
• Designed for commercial marine navigation
• Replaceable gyrosphere/container architecture
• Compatible with NAVIGAT heading-distribution equipment when correctly matched
• Suitable for existing legacy NAVIGAT X installations
The NAVIGAT X MK1 also provides a high-speed follow-up rate of up to 100°/second and multiple serial heading outputs as part of the complete gyrocompass system.
A vessel may require gyrosphere inspection or replacement when experiencing symptoms such as:
Gyro Does Not Settle
The system remains unable to establish a stable heading after the expected settling period.
Large Heading Error
Heading remains significantly different from another verified reference.
Unstable Gyro Heading
Heading fluctuates excessively after normal initialization.
Gyrosphere Current Alarm
Electrical or gyrosphere-related monitoring indicates abnormal operation.
Repeated Gyro Failure
The gyro loses heading or cannot remain north stabilized.
Mechanical / Container Problem
Supporting-fluid, centering, container or internal gyrosphere issues may affect operation.
These symptoms do not automatically prove the gyrosphere itself is defective; power, control electronics, follow-up system, supporting fluid and system configuration should also be checked.
A replacement gyrosphere should never be selected only by physical appearance.
Before supplying a replacement, verify:
• Gyrocompass model
• NAVIGAT X MK1 or MK2
• Gyrosphere Type
• Container Modification
• Existing part/stock number
• Mercury or mercury-free configuration where applicable
• Vessel installation details
• Photographs of existing equipment
Sperry's documentation lists multiple gyrosphere and container versions, so correct matching is essential.
The floating gyrosphere design uses a supporting-fluid arrangement.
Correct fluid condition and service procedures are therefore important whenever the gyrosphere or container is opened or replaced.
Marine-market references identify Sperry Supporting Liquid 044810 for NAVIGAT X MK1/MK2 applications, but the exact fluid and service procedure should always be confirmed against the relevant system documentation before use.
Sperry Marine NAVIGAT gyrocompasses are commonly found aboard:
• Container Ships
• Bulk Carriers
• Oil Tankers
• Chemical Tankers
• LNG/LPG Carriers
• Passenger Ships
• Offshore Vessels
• Survey Vessels
• Cargo Ships
• Merchant Vessels
Accurate gyro heading is fundamental to safe navigation and to multiple interconnected bridge systems.
SM MARINE SERVICE™ can also support sourcing of marine gyrocompass equipment and spare parts across multiple manufacturers and models, subject to availability and correct part identification.
Typical requirements include:
• Gyrosphere / Gyro Sphere
• Sensitive Element
• Gyro Element
• Gyro Container
• Supporting Liquid
• Control Unit
• Control & Display Unit
• Power Supply Unit
• PCB / Processor Board
• Amplifier Board
• Converter Unit
• Heading Distribution Unit
• Gyro Repeater
• Bearing Repeater
• Steering Repeater
• Interface Unit
• Cables & Connectors
Common marine gyro brands searched by vessel operators include Sperry Marine, Anschütz, Raytheon Anschütz, Yokogawa, Tokyo Keiki / Tokimec, Teledyne TSS / S.G. Brown and other marine navigation manufacturers.
Compatibility between different manufacturers must always be verified individually.
When the existing gyrocompass electronics, cabinet, heading outputs and bridge interfaces remain serviceable, replacing the defective gyro element may allow the vessel to continue using its existing system.
This can avoid unnecessary changes to:
• Radar heading interfaces
• ECDIS heading input
• Autopilot interface
• Repeaters
• VDR connections
• Bridge cabling
• Existing mounting arrangements
For older NAVIGAT X installations, sourcing the correct replacement gyrosphere can therefore be commercially attractive compared with an immediate complete-system retrofit.
SM MARINE SERVICE™ can support sourcing for:
Sperry Marine NAVIGAT X MK1
Sperry Marine NAVIGAT X MK2
NAVIGAT-series gyrocompass equipment
Gyrospheres and gyro containers
Supporting liquid
Control and display units
Power/interface equipment
Gyro repeaters
Electronic boards and modules
Available condition may include:
New • Used • Tested Working • Refurbished • Reconditioned
Customers should send the model, part number and clear equipment photographs for compatibility checking.
It is the north-seeking sensitive element at the heart of applicable Sperry spinning-mass gyrocompass systems.
Yes. Sperry Marine's official documentation identifies gyrosphere equipment as part of the NAVIGAT X MK1 system.
Yes. NAVIGAT X MK2 documentation describes the gyrosphere as the system's north-seeking element.
Do not assume interchangeability. Different gyrosphere types and container modifications exist. The exact type and configuration must be checked before replacement.
Sperry Marine certification documentation identifies 4911 and 5000 variants as gyrospheres within approved NAVIGAT equipment configurations.
Yes. Complete gyrocompasses, gyro elements, sensitive elements, repeaters, control units, PCBs, power supplies and other marine gyro spare parts can be sourced subject to availability.
Compatibility should not be assumed. Different manufacturers use different gyro technologies, mechanical arrangements and interfaces. Supply should always be based on the exact gyro model and part number.
SM MARINE SERVICE™ can support international sourcing and supply of Sperry Marine NAVIGAT gyrospheres and related gyrocompass spare parts, subject to stock and compatibility verification.
Sperry Marine's official NAVIGAT X MK1 brochure describes the gyrocompass architecture, buoyancy-supported gyrosphere, heading interfaces, monitoring functions and operating characteristics.
Official Sperry Marine NAVIGAT X MK1 Brochure
Sperry Marine maintains official information covering upgrade paths for existing NAVIGAT X MK1 and MK2 installations.
Sperry Marine Compass Brochures & NAVIGAT Upgrade Information
Sperry Marine NAVIGAT X MK1 / MK2 Gyrosphere is the precision north-seeking gyro element used in applicable NAVIGAT X marine gyrocompass systems. Multiple gyrosphere and container configurations exist, including Type 4911/5000 and associated container modifications. SM MARINE SERVICE™ can support worldwide sourcing of gyrospheres, gyro elements, containers, supporting liquid, repeaters and other marine gyrocompass spare parts in new, used, tested, refurbished and reconditioned condition.
Marine Automation, Navigation & Communication Equipment Supplier
Products & Services:
Marine Gyrocompass • Gyrosphere • Sensitive Element • Navigation Equipment • Automation Equipment • Spare Parts • Repair Support • Equipment Sourcing
Available Condition: New • Used • Tested • Refurbished • Reconditioned
Stock / Sourcing: Bangladesh • China • Worldwide
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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