RAYTHEON MARINE GMBH 135-097 NG012 0363 SIGNAL UNIT NAUTO ALARM E00

Product Identification

• Manufacturer: Raytheon Marine GmbH. This is the German branch of the former Raytheon marine electronics division, now largely part of Furuno after acquisitions. Older equipment will still bear the Raytheon or Raytheon Anschütz branding.
• Part Number / Article Number: 135-097
• Additional Code: NG012 0363
• Product Type: Signal Unit
• Model / Application: Nauto Alarm E00. This strongly indicates it is part of an autopilot system.

Product Description

This “Signal Unit” is a critical sensor component within a Raytheon (Anschütz) ship’s autopilot system, specifically for the Nauto Pilot series.

Its primary functions are:

1. Rudder Feedback: It is most commonly a rudder angle transducer or feedback unit. It precisely measures the actual position of the ship’s rudder and sends this electrical signal back to the autopilot control unit.
2. System Integrity: It provides the essential “closed-loop” feedback necessary for the autopilot to compare the commanded rudder angle with the actual rudder angle. Without this signal, the autopilot cannot function correctly and will typically generate a “Rudder Feedback” or “Nauto Alarm E00” fault.
3. Alarm Generation: The “E00” in its name directly refers to a common fault code displayed on the autopilot control head. When this unit fails, loses power, or its signal is interrupted, it triggers the E00 alarm, indicating a failure in the signal unit circuit.

Common Context & Symptoms

• Alarm: If your autopilot system is displaying a persistent “Nauto Alarm E00”, this signal unit is the very first component to check.
• Troubleshooting: Checks include verifying the wiring, connections, and power supply to this unit. Physical damage or internal failure of the transducer itself is common.
• Location: It is typically installed in the steering gear compartment, mechanically linked to the rudder stock or steering linkage.