Realvision 3D Ahrs Calibration - Raymarine LIGHTHOUSE 3 Advanced Operation Instructions

Important:
• The Ping depth limit should only be enabled when problems are experienced re-acquiring
depth readings after the sonar has lost depth readings.
• Once Ping depth limit is enabled, when sailing in waters deeper than the specified depth limit
the Fishfinder app / transducer will not be able to establish a depth reading / bottom lock.
The Ping depth limit control enables you to specify a depth limit that your sonar will search down to.
It is recommended that limit is set to a depth of approximately 25% to 50% deeper than the maximum
water depth you want to use your Fishfinder in. E.g.: In 200 ft max depth water the ping depth
limit should be set between 250 ft and 300 ft.
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
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Calibrated