Raymarine Raydata Installation And Operating Handbook
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Contents
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32 RAYDATA Installation and Operation HandbookThere are two methods of updating the speed calibration:• Automatic calibration. You travel a known distance, and theRayData calculates and stores the required calibration factor.• Manual calibration. If you know the calibration factor required foryour vessel, or if you wish to calculate it yourself, you can set theRayData’s speed calibration value.In both cases, you need to use the Speed Calibration option from theSetup pages, as described on the following pages for each method.Automatic CalibrationTo calibrate the speed automatically, run between two points a knowndistance apart while the RayData monitors the speed data. You canperform up to four calibration runs, and the RayData averages theinformation to obtain the calibration factor that will be used to correct thespeed data displayed.Select an easily identifiable measured distance from the chart (between0.5 and 1.0nm), and carry out the calibration when the tide flow is least.You should complete a minimum of two runs, one in each direction, tocancel the tidal effect.To perform the speed calibration:1. If one of the Setup pages is not currently displayed, press NAV andÙÙÙÙÙ together to display the first Setup page.2. Press SPEED. The Auto Speed Cal page is displayed.D3043-2The display shows that the current calibration run number is 1, andprovides a default of 1.00nm for the length of the calibration run.3. Use the ÙÙÙÙÙ key to increase or the ÚÚÚÚÚ key to decrease the value ofthe calibration run length, until it matches the length of thecalibration distance you plan to use for this run. You cannot changethe distance units here. |
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