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MANUAL
SIMRAD AUTOPILOT
Compass
20220653C
English

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Summarization of Contents

COMPASS TYPES
Magnetic compass
Conventional liquid-filled magnetic compass for smaller boats.
Fluxgate compass
Picks up Earth's magnetic field directly, sensitive to vessel motion.
Rate compass (RC25, RC36, RC37)
Combination of rate sensor and fluxgate sensor for stable steering.
Rate Compass performance diagram
Graph showing performance comparison of different compass types.
Gyro compass
Uses spinning wheel and gravity for True North reference, unaffected by magnetic conditions.
Compass type selection guide
Table recommending compass types based on boat type and size.
DESCRIPTION OF MODELS
RFC35 Fluxgate compass
Floating ring core compass with PWM signal output.
RFC35N NMEA Compass
RFC35N with NMEA PCB for NMEA0183 HDG format output.
RFC35NS Compass (RFC35N + SIN)
RFC35N with optional SIN PCB for analogue Sine/Cosine output.
Rate compass (RC25, RC36, RC37)
Rate compass models with different output signals for specific autopilots.
Adding a SIN PCB to RFC35N Compass
Instructions on how to install a SIN PCB into the RFC35N.
LOCATION AND INSTALLATION
Inspection of mounting area
Checks for potential sources of magnetic interference in the mounting area.
Installation
Guidance on placing and testing the compass in its mounting location.
Northerly / Southerly turning error
Discusses turning errors at high latitudes and their mitigation.
WIRING & CALIBRATION
RFC35 Fluxgate Compass
Wiring and connection details for RFC35 to specific autopilots.
RC25 Rate Compass (Robnet)
Recommended connection and setup for RC25 Rate Compass.
RC36 Rate Compass (Robnet2)
Connection and setup for RC36 Rate Compass with Robnet2.
RFC35N NMEA Compass
Connection instructions for RFC35N NMEA Compass to IS15 instruments.
RC37 Rate Compass
Connection instructions for RC37 Rate Compass to AP45 and AP9MK3.
RFC35NS Compass (NMEA+SIN)
Instructions for RFC35NS Compass as RFC250 substitution.
TECHNICAL SPECIFICATIONS
RFC35 Fluxgate Compass
Detailed specifications for the RFC35 Fluxgate Compass.
RC25 Rate Compass
Detailed specifications for the RC25 Rate Compass.
RC36 Rate Compass
Detailed specifications for the RC36 Rate Compass.
RC37 Rate Compass
Detailed specifications for the RC37 Rate Compass.
RFC35N NMEA Compass
Detailed specifications for the RFC35N NMEA Compass.
Optional SIN PCB
Specifications for the optional SIN PCB accessory.
RFC35NS Fluxgate Compass
Detailed specifications for the RFC35NS Fluxgate Compass.

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