What class of vessel is the Walker SR4 Magnetic Compass designed for?

The Walker SR4 is a Class A magnetic compass designed for SOLAS-regulated vessels of 150 gross tonnage and above, satisfying SOLAS Chapter V Regulation 19 carriage requirements.

Is the John Lilley & Gillie Walker SR4 SOLAS approved?

The SR4 is designed and built as a SOLAS-type Class A magnetic compass in accordance with the relevant IMO performance standards and SOLAS Chapter V Regulation 19 requirements.

What type of reading system does the SR4 use?

The SR4 uses a reflector / prism viewing system that allows the navigator to take accurate bearings from the standard compass viewing position.

Can the SR4 be installed on an open bridge or does it require a wheelhouse?

The Walker SR4 is suitable for wheelhouse, monkey island, or open-bridge installation, using a pedestal or binnacle mounting configuration.

Are corrector devices included with the SR4?

The SR4 binnacle provides mounting provision for the standard set of magnetic correctors (quadrantal spheres, heeling error magnet, and Flinders bar). Correctors are typically selected per vessel and may be sourced through Seanav Marine.

Does the SR4 require annual calibration?

Yes. SOLAS and most classification societies require an annual compass swing and updated deviation card. Seanav Marine offers magnetic compass calibration services in the UAE and across Indian ports.

Are OEM spare parts available?

Yes. OEM spares including replacement compass cards, pivots, jewels, bowl assemblies, and corrector magnets are available through Seanav Marine.

Which classification societies accept the SR4?

The SR4 is generally accepted by major classification societies including Lloyd's Register, Bureau Veritas, DNV, and ABS, subject to individual class review of the installation. UAE-flagged vessels subject to FTA oversight are supported.

Can Seanav Marine coordinate port delivery to UAE ports?

Yes. Seanav Marine coordinates delivery to Jebel Ali, Port Rashid, Khalifa Port, Port of Fujairah, and Khor Fakkan, as well as to other international ports.

Is the SR4 suitable as a backup to a gyrocompass?

Yes. The SR4 is commonly used as a magnetic heading backup to the ship's primary gyrocompass, providing an independent heading source required by SOLAS.

JLG Walker SR4 Magnetic Compass Class A

John Lilley & Gillie Walker SR4 Magnetic Compass Class A

The John Lilley & Gillie Walker SR4 Magnetic Compass Class A is a SOLAS-compliant marine magnetic compass engineered for commercial vessels operating under international safety regulations. Designed as a Class A compass for ships of 150 gross tonnage and above, the SR4 provides reliable magnetic heading reference with a 360° azimuth reading, integrated correction facilities, and rugged marine-grade construction suited to wheelhouse or exposed bridge mounting. This reflector-style compass supports the IMO carriage requirements for primary magnetic heading reference aboard SOLAS-regulated vessels. Suitable for new installations and replacement refits, the SR4 is trusted by operators worldwide. For technical datasheets, spares,…

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.

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	SEANAV-CMP-SR4
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

B2B Marine Procurement & Same-Day Port Dispatch

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 →).

WhatsApp Direct RFQ (+91 75492 76285) Email Official RFQ (service@seanav.org) Magnetic Compass Adjustment & Deviation Card Service →