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The RC25 Rate Compass is a heading sensor used in older Simrad autopilot systems (e.g., AP35, AP50 and similar models). It combines two types of sensors:
A rate sensor that detects changes in heading (how fast the boat is turning), and
A fluxgate magnetic sensor that measures compass heading.
Unlike a simple fluxgate compass alone, a rate compass is great for autopilots because:
The rate sensor responds quickly to turning motion without being confused by pitch and roll.
The fluxgate part keeps the heading from drifting over time.
Together this gives a stable and responsive heading input that helps the autopilot steer accurately.
Type
Combined rate sensor + magnetic fluxgate heading sensor for autopilot heading input. Uses a solid-state rate gyro slaved to a fluxgate compass to provide a stable heading output for autopilots.
Interface / Connector
Robnet-type connector (not Robnet2) with approx. 15 m (49 ft) cable pre-attached.
Compatibility
Designed for older Simrad autopilot systems (AP11, AP20/21/22, AP35, AP50, AP300X, etc.), using the original Robnet communications.
Physical Characteristics
Cable length: ~15 m (49 ft).
Weight: ~0.9 kg (2.0 lbs).
Approximate dimensions (from typical listings): ~7″ × 7″ × 7″ (18 × 18 × 18 cm) – typical for this model type.
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