Raymarine Heading Sensor Owner's Handbook Manual
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Contents
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12 Heading Sensor Owner’s HandbookTo ensure that the compass has received accurate data, perform thefollowing procedure:1. Choose a calm day, and select an area of open water. Ideally, thecurrent and tide effects should be at a minimum.2. Calculate the size of circle you need to make in order to keep yourturn rate down to not less than 45 seconds for each 90° of turn.You can turn more slowly than this, and you do not need to keep toan exact circle, but if you turn too quickly the deviation data will beignored.3. Turn your vessel continuously through two full circles (720°), at aslow, steady speed, keeping the vessel level. You can go eitherclockwise or anti-clockwise.4. Ideally, continue to turn through a further two full circles to ensureyou have obtained accurate data.The Heading Sensor will now correct all heading readings using thevariation data obtained.4.3 Heading AlignmentAfter you have performed the Continuous Deviation Correctionprocedure, you should check the heading alignment. You can do sousing one or both of the following techniques:• Compare the heading information on your display instrument (suchas a XX Radar or RayData) with the ship’s magnetic compass forseveral headings.Note: Your magnetic compass must be accurate, and should havebeen calibrated recently.• Choose reference points from a chart, and navigate between them.Then compare the readings from your Heading Sensor with theactual chart courses.If the Heading Sensor’s readings differ from the actual readings by aconstant amount, you need to correct the heading alignment. This isachieved by adjusting the position of the compass, as follows:1. Loosen the Heading Sensor mounting slightly, so that you canrotate the sensor. To do this, use the Allen key supplied with theHeading Sensor to loosen the Allen bolt in the top of the HeadingSensor mounting bracket (see page 7).124_3c04.p65 09/05/01, 11:3012 |
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