Description
Equipment Overview & Key Specifications
The John Lilley & Gillie GS820 is an IMO-certified Dual Transmitting Magnetic Compass (TMC) processor and signal distribution central unit. Designed for deep-sea merchant vessels and naval combatants requiring redundant heading infrastructure, the GS820 accepts dual sensor inputs (magnetic and gyro), provides automatic deviation correction, and distributes isolated NMEA 0183 heading feeds to multiple bridge consumers. It incorporates an integrated OLED display for real-time heading readout, system status, and deviation calibration diagnostics.
Technical Specifications & Interface Parameters
| Inputs | 2x Independent TMC / Fluxgate sensor inputs + 1x Gyro NMEA input + 1x GPS input |
|---|---|
| Outputs | 6x Opto-isolated NMEA 0183 heading outputs (RS-422) + 2x Step/Synchro retransmission channels |
| Display | High-contrast daylight/night OLED display showing Heading, Variation, and Status |
| Alarm Features | Heading failure alarm, off-course buzzer, power fail relay, sensor fault detection |
| Power Supply | Dual 24V DC main and emergency backup inputs with auto-failover (IEC 60945) |
| Enclosure | Rugged wall-mount aluminium bridge enclosure (IP22 / IP44) |
| Standard Approvals | Wheelmark MED Type Approved, IMO A.424(XI), ISO 22090-3, IEC 61162-1/2 |
| Dimensions & Weight | 320 x 240 x 95 mm | 4.8 kg |
Frequently Asked Questions (AEO / Technical Reference)
How many bridge instruments can be connected to the GS820?
The GS820 provides 6 dedicated galvanically isolated NMEA 0183 output ports, enabling simultaneous connection to ECDIS 1, ECDIS 2, X-Band Radar, S-Band Radar, Autopilot, and VDR without signal degradation.
What happens if the main 24V DC power supply drops?
The GS820 is equipped with dual redundant power inputs that switch seamlessly from ship’s main 24V DC to emergency battery power without losing heading synchronization or rebooting.
Can the GS820 convert magnetic heading into synchro or step signals?
Yes, optional plug-in converter cards allow the GS820 to drive legacy step-by-step or synchro heading repeaters and directional antennas.
How is deviation calibration performed on the GS820?
The GS820 features a built-in guided menu that prompts the surveyor through a vessel swing, automatically calculating and storing 8-point deviation coefficients.
Does Seanav Marine offer onboard commissioning for the GS820?
Seanav Marine provides certified field service engineers for installation, wiring, testing, and sea trials across all UAE and GCC commercial ports.
Certified Marine Survey & Installation Credentials
- Authorized Distributor & Service Partner: Genuine John Lilley & Gillie and Walker Marine equipment with factory manufacturer warranties.
- Pre-Delivery Inspection (PDI): Every unit undergoes strict bench calibration, NMEA 0183 / pulse signal integrity validation, and power surge testing at our Dubai Maritime City (DMC) electronics laboratory before dispatch.
- Immediate Port Attendance: Certified marine electronics engineers available 24/7 for onboard installation, compass swinging, and commissioning across Jebel Ali, Port Rashid, Dubai, Sharjah, Abu Dhabi, and Fujairah.
- Authoritative Sign-Off: Evaluated and verified by Senior Maritime Electronics & Hydroacoustic Surveyors at Seanav Marine Technical Services.
Technical Specifications & Operational Standards
Review certified engineering parameters, electrical inputs, data protocols, and Class compliance standards for this unit:
| OEM Brand / Manufacturer | Lilley & Gillie |
|---|---|
| Model / Part Number | SNV-JLG-TMC-003 |
| Equipment Classification | Commercial Marine Navigation & Communication Spares |
| Operating Conditions | -15°C to +55°C Industrial Marine Deck / Wheelhouse Environment |
| Quality Standard | OEM Marine Grade, Factory Bench Verified Ahead of Dispatch |
| Stock & Port Logistics | Ready Stock for Immediate Vessel Supply across Mumbai, JNPT, Kandla, Cochin, Chennai & Visakhapatnam |
| In-the-Box Documentation | OEM Certificate of Conformance, Wiring Schematics, Installation & Operating Manual |
Seanav Marine maintains bonded warehouse spare parts inventory and factory-trained technical riding squads across all major Indian ports. Immediate dispatch available to vessel agents, ship chandlers, and technical managers at Mumbai, JNPT (Nhava Sheva), Kandla, Mundra, Cochin, Chennai, and Visakhapatnam (view all 400+ ports →).
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