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5.1 RealVision™ 3D AHRS calibration
RealVision™ 3D transducers include a built-in AHRS (Attitude and Heading Reference Sensor), which
measures the motion of your vessel to assist in the rendering of sonar images. After installation all
RealVision™ 3D transducers require calibration.
An uncalibrated transducer can produce an offset to the front edge of the render of the bottom in
the sonar image, as illustrated below.
Uncalibrated
Calibration is an automatic process and starts after your vessel has turned approximately 100° at a
speed of between 3 –15 knots. Calibration requires no user input, however at least a 270° turn is
required before the calibration process can determine the local deviation and apply a relevant offset.
The time it takes to complete the calibration process will vary according to the characteristics of
the vessel, the installation environment of the transducer, and the levels of magnetic interference
at the time of conducting the process. Sources of significant magnetic interference may increase
the time required to complete the calibration process. Certain areas with substantial magnetic
deviation may require extra circles or "figure of 8" manoeuvres to be performed. Examples of such
sources of magnetic interference include:
• Vessel engines
• Vessel alternators
• Marine pontoons
• Metal-hulled vessels
• Underwater cables
Note:
In some circumstances, it is beneficial to disable Realvision AHRS if local sources of magnetic
interference are distorting the sonar image. Realvision AHRS can be disabled from Settings.
Menu > Settings > Sounder > AHRS stabilization
Note:
The Calibration process will require repeating after a Sonar reset or MFD Factory reset.
5.2 Troubleshooting
The troubleshooting information provides possible causes and corrective action required for common
problems associated with installation and operation of your product.
Before packing and shipping, all Raymarine products are subjected to comprehensive testing and
quality assurance programs. If you do experience problems with your product this section will help
you to diagnose and correct problems in order to restore normal operation.
If after referring to this section you are still having problems with your product, please refer to the
Technical support section of this manual for useful links and Raymarine Product Support contact
details.
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Calibrated
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Table of Contents
Troubleshooting
