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The Anschütz STD-20 Gyro Compass is a marine navigation instrument used on ships to provide highly accurate heading information without reliance on magnetic compasses. It uses a gyroscopic sensor to determine the vessel’s orientation relative to true north.
The outer spare PCB in this context refers to one of the printed circuit boards located outside the main gyro sensor assembly. This PCB typically handles functions such as:
Control & interface logic between the gyro sensors and external ship systems
Signal conditioning for heading outputs
Power distribution and regulation
Communication ports (e.g., NMEA, analog/digital outputs)
Input processing from switches, displays, or remote units
Supply Voltage: 24 V DC nominal (range ≈ 18 – 36 V DC)
Power Consumption:
• Sensor run-up: ~35 W
• Sensor operating: ~30 W
• Heating element (temporary): up to ~75 W
• Fan: ~3 W
Signal Outputs: Serial interface (e.g., heading serial at 9600 baud)
Communication: Provides heading over digital outputs and may interface with analog rs‐422 or repeater equipment via distribution modules.
Static Accuracy: ≤ ±0.1° secLat (RMS)
Dynamic Accuracy: ≤ ±0.4° secLat (RMS, includes roll/pitch effects)
Settle Time: ~3 hours to stable reference
Maximum Follow-Up Rate: ~70°/s
Acceleration of Follow-Up: ~150°/s²
(Note: secLat = error scaled by latitude correction factor 1/cos(latitude).)
Operating Temperature: –10 °C to +55 °C
Storage Temperature: –25 °C to +70 °C (without supporting liquid)
Enclosure Protection: typically suitable for marine environments (IP23 classification)
Permissible Roll & Pitch: ±45°
Maintenance Interval: ~3 years (system service recommendation)
Digital Course Outputs: Standard serial format (e.g., “HEADING SERIAL”, 9600 baud)
Interfacing: Designed to communicate with autopilots, radar/ECDIS displays, and external heading repeaters, often via distribution or booster units.
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