Technical manual covering installation, operation, maintenance, and administration of navigation systems, equipment, and aids for naval ships (CH‑420).
This manual provides comprehensive guidance for the organization, administration, maintenance, installation, and operation of all navigation systems, equipment, and aids used on naval ships. It is organized into sections covering general requirements, non‑electrical aids, electronic radio and space‑based systems, acoustic and electrical navigation equipment, and inertial navigation systems.
Each section details responsibilities, training, parts lists, installation procedures, wiring diagrams, preventive maintenance, and record‑keeping. Specific equipment such as gyrocompasses, magnetic compasses, inertial navigation units, and various radio navigation systems are described with their operational modes, maintenance tasks, and required accessories.