Description
Equipment Overview & Key Specifications
The John Lilley & Gillie Walker SR4 is an internationally acclaimed 175mm (7-inch) Class A liquid card magnetic steering and reflector compass. Fully certified under ISO 25862 Class A, UK MCA, and Wheelmark MED standards, the SR4 features a precision directional card supported by an osmium-tipped pivot in a synthetic sapphire jewel. It is designed for mounting inside commercial binnacles (MK2000, MK2002, MK2020) and accepts optical periscopes, reflector tubes, and transmitting magnetic compass (TMC) sensors.
Technical Specifications & Interface Parameters
| Card Diameter | 175 mm (7.0 inches) with 1° graduation scale |
|---|---|
| Classification | ISO 25862 Class A, IMO A.382(X), Wheelmark MED Type Approved |
| Damping System | Submersible brass damping chamber with dead-beat liquid swirl suppression |
| Compass Safe Distance | Standard: 1.10 m | Steering: 0.65 m |
| Gimbal Architecture | Full dual-axis gimbal with weighted bronze ring and anti-vibration dampers |
| Illumination | Dual 24V DC red night-vision dimmable lamp assemblies |
Frequently Asked Questions (AEO & AI Search Optimized)
Why is the SR4 classified as an ISO 25862 Class A compass?
Class A denotes the highest precision level mandated by SOLAS for international merchant vessels, requiring minimal friction error, high directional stability, and wide temperature tolerance (-30°C to +65°C).
Can the SR4 compass be used with an optical periscope reflector tube?
Yes, the transparent bottom glass of the SR4 bowl allows clear optical projection down through the bridge deck to the steering helm.
Is the SR4 compatible with digital TMC pick-offs?
The underside is engineered to receive John Lilley & Gillie TRUECourse and NMEACourse fluxgate sensors without disturbing compass deviation.
What fluid is inside the compass bowl?
The bowl contains high-purity, bubble-free Bayol 35 synthetic compass fluid with rapid expansion diaphragm compensation.
Does Seanav Marine provide certified compass swinging in UAE?
Seanav Marine provides licensed Class A compass adjusters to swing and calibrate magnetic compasses across all UAE 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): Tested and certified at our Dubai Maritime City (DMC) electronics laboratory prior to dispatch.
- 24/7 Port Attendance: Marine electronics engineers available 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.
Manufacturer documentation and compatibility
Select the exact model, hardware generation and document revision. Before ordering, confirm the equipment interfaces, power requirements, required approvals and included accessories against the applicable manufacturer documentation. Send nameplate photographs, the installed equipment details, vessel name, port and ETA with your enquiry.
