The Lilley & Gillie Marine Pelorus is a precision bridge navigation instrument manufactured by John Lilley & Gillie Ltd. in the United Kingdom. Designed for taking accurate visual bearings of terrestrial landmarks, navigational lights, and celestial bodies, this instrument allows ship officers to calculate gyrocompass error, verify magnetic compass deviation, and execute optical position fixing.

Featuring an internal two-axis gimbal system, the compass dial remains level during heavy vessel motion, pitch, and roll. Built with marine-grade corrosion-resistant materials and equipped with fine sighting vanes, the Lilley & Gillie pelorus is an essential non-electronic navigation reference for commercial merchant ships, tankers, and naval vessels.

Key Features:
• Precision Optical Sighting: High-accuracy sighting vanes and prism attachment enable sharp target alignment for visual bearing measurement.
• Internal Gimbal System: Balanced dual-axis gimbal maintains dial horizontality in rough seas.
• High-Visibility 360° Dial: Clear 360-degree card with fine 1-degree division markings for effortless reading.
• Marine-Grade Construction: Manufactured from durable, corrosion-resistant brass, bronze, and protective-coated housings.
• SOLAS Bridge Compliance: Delivers a reliable visual bearing backup and primary tool for compass error verification.