JRC JLR-21/31 GPS Compass Instruction Manual

About this manual

This manual covers the JRC JLR-21/31 GPS Compass, a shipboard unit that uses signals from GPS satellites to determine the ship's heading. It includes safety symbols and precautions, installation guidance, display and operation instructions, maintenance, troubleshooting, after-sales service, disposal, specifications, and appendices.

The equipment comprises an NWZ-4701 display unit and an NNN-21 or NNN-31 sensor unit. The manual also describes standard equipment, system diagrams, cable connections, menus, alerts, and regular replacement parts.

What's inside

• Equipment Overview
• Installation
• Names and Functions of Each Unit
• Display
• Operation
• Maintenance and Inspection
• After-Sales Service
• Disposal
• Specifications
• Appendices

Frequently asked questions

What does the JLR-21/31 use to determine the ship's heading?

It uses signals from GPS satellites.

How far should the unit be installed from a magnetic compass?

At least 1 m.

What units make up the standard equipment?

An NWZ-4701 display unit and an NNN-21 or NNN-31 sensor unit.

Can the JLR-21/31 measure a tsunami?

No, it is not possible to measure the tsunami.