Description
Equipment Overview & Key Specifications
The John Lilley & Gillie TRUECourse is an advanced solid-state Transmitting Magnetic Compass (TMC) and heading sensor engineered to convert standard magnetic compass readings into digital NMEA 0183 heading sentences (HDT/HDM). Conforming to IMO MSC.116(73) and ISO 22090-3 standards, TRUECourse attaches non-intrusively to any reflector or overhead magnetic compass without disturbing physical balance or deviation cards. It features automated deviation compensation, rate-of-turn dampening, and high-speed data transmission for radar, ECDIS, and autopilot redundancy.
Technical Specifications & Interface Parameters
| Heading Accuracy | Better than ±0.5° dynamically | Resolution 0.1° |
|---|---|
| Output Protocols | IEC 61162-1 / NMEA 0183 (HDT, HDM, HDG, ROT sentences) |
| Baud Rates | Configurable 4800, 9600, or 38400 bps (IEC 61162-2 high speed) |
| Update Rate | Up to 50 Hz output for high-speed ARPA radar & autopilot heading feed |
| Operating Voltage | 12V – 32V DC wide-range marine power input (galvanically isolated) |
| Power Consumption | < 3.5 Watts nominal |
| Mounting | Non-intrusive sensor bracket mounted directly above or below compass bowl |
| Certifications | Wheelmark MED Type Approved, IMO MSC.116(73), ISO 22090-3, IEC 60945 |
Frequently Asked Questions (AEO / Technical Reference)
Why is a Transmitting Magnetic Compass (TMC) required on commercial vessels?
IMO and SOLAS require commercial vessels to maintain an independent electronic heading source. In the event of gyrocompass drift or power loss, TRUECourse immediately feeds real-time magnetic heading to ECDIS, radar, and VDR.
Does TRUECourse require drilling into the magnetic compass bowl?
No. TRUECourse utilizes precision external pick-off sensors that mount cleanly to the exterior gimbal or binnacle housing without compromising fluid seals or requiring magnetic compensation changes.
Can TRUECourse output TRUE heading or only MAGNETIC heading?
When interfaced with an external GPS receiver via NMEA 0183 (RMC/GGA), TRUECourse automatically applies local magnetic variation to compute and output true heading (HDT).
What autopilots and radars are compatible with TRUECourse?
TRUECourse interfaces seamlessly with all leading bridge systems, including Furuno, JRC, Sperry Marine, Raytheon Anschütz, Simrad, Navitron, and Highlander bridge consoles.
What testing is conducted by Seanav Marine before delivery?
Seanav Marine performs rigorous 24-hour thermal soak testing, NMEA sentence validation, and baud rate handshaking checks at our Dubai Maritime City lab before dispatch.
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-001 |
| Equipment Classification | Class A Marine Steering & Bearing Magnetic Compass |
| Card Diameter & Style | 165 mm / 6-inch Transparent Card with Full Gimbal Suspension |
| Binnacle Compatibility | Reflector Binnacle, Pelorus Stand, and Overhead Bridge Mountings |
| Standard Approvals | ISO 25862:2019, SOLAS Chapter V, DGS Merchant Shipping Standards |
| Deviation Calibration | Pre-magnetized B/C Quadrantal Corrector Spheres & Flinders Bar included |
| 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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