Swinging the Compass

You will need to turn your vessel in slow circles while the system automatically makes adjustments to account for compass deviation. Each 360-degree circle should take no less than 2 minutes, and you should complete at least 2 circles.
CalibrationCompassCompassDeviationIt is recommended that a second display or MFD is used to display heading data, whilst performing the Compass Swing.
From the Transducer Set-up menu: Menu > Set-up > Transducer Set-up
  1. Select Continue.
    A list of connected devices is displayed. (e.g.: iTC-5, DST, or transducer pod).
  2. Select iTC-5.
    A list of available transducers is displayed.
  3. Select Compass.
  4. Swing compassSelect Swing Compass.
  5. Start moving vessel in slow even circles, then press Start.
  6. Keep vessel speed below 2 knots. Watch the display to ensure your turn rate is not too fast. If the message ‘Slow Down — turn rate too fast’ is displayed, reduce your rate of turn; this can be achieved by slowing down and / or steering in a wider circle.

    If the 'Slow Down — turn rate too fast' message is displayed, the current circle will have to be repeated.

    When the Compass has been successfully calibrated, a message will be displayed showing the detected compass deviation.

  7. If the deviation is greater than 15 degrees, you will need to relocate the Compass farther away from metal items or items that may cause interference, then repeat the calibration process. If you still find a deviation of more than 15 degrees, contact your Raymarine dealer for advice. If the deviation is within acceptable limits, press Continue.