Simrad Autopilot Compass
8 20220653 / Rev. C
2.4 Rate Compass performance diagram
Measurements made at open sea in a 33-ft. powerboat.
The ideal reference shown on the graph is performed by the
Robertson SKR-82 Gyrocompass.
2.5 Gyro compass
A gyro compass does not use the Earth’s magnetic field to seek
North, thus being unaffected by the magnetic conditions
onboard.
The North seeking mechanism utilizes a spinning wheel (gyro)
supported in a 3-axis gimbal or sphere and controlled by
damping weights and electronics. By sensing gravity and the
Earth’s rotation it makes the axis of the spinning wheel always
point towards True North. The reading of a gyrocompass is also
more stable than that on a magnetic compass.
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