Raymarine LIGHTHOUSE 3, Advanced Operation Instructions

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17.9 AR200 Calibration (Linearization)
To enable accurate placement of Augmented Reality (AR) flags on the camera’s video feed, the
AR200’s AHRS sensors need to compensate for local magnetic fields, as well as the Earth’s magnetic
fields.
Calibration is achieved using an automatic linearization process. The linearization process starts
automatically after your vessel has turned approximately 100°, when travelling at a speed of between
3 to 15 knots. The linearization process requires no user input, however at least a 270° turn is
required before linearization can be completed. The duration of the linearization process can be
decreased by completing a full 360° turn, when travelling at a speed of between 3 to 15 knots. The
linearization process can also be restarted at anytime.
In the Video app the Linearization progress bar is displayed when linearization is in progress. The bar
is filled to indicate completeness, and will turn Red if the process is paused or otherwise interrupted.
The time taken to complete the linearization process will vary according to the characteristics of the
vessel, the AR200’s installation location, and the levels of magnetic interference present at the time
linearization is performed.
Magnetic interference can be caused by objects onboard your vessel, such as:
• Speakers
• Electronic equipment
• Electrical cabling
• Metal bulkhead or hull
Magnetic interference can also be caused by external objects in close proximately to your vessel,
such as:
• Metal hulled vessels
• Underwater electrical cables
• Marine pontoons
Magnetic deviation
Magnetic deviation is the error induced in a compass caused by interference from local magnetic
fields.
The automatic linearization process results in a deviation value being set for your AR200. If
Augmented Reality flags in the Video app are not aligned with their onscreen objects, or the compass
is out of alignment, you should check the AR200’s current calibration settings. For instructions on
how to do this, refer to:
AR200 calibration settings
AR200 calibration settings
The calibration settings page provides access to the AR200’s compass calibration options.
The AR200 calibration page can be accessed using your Data master MFD; from the Homescreen
select:
Settings > Network > Data sources > Heading > AR200 > Calibrate .
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