Performing a Speed Run Calibration using SOG

If a higher level of precision is required than that achieved with the one point (quick) Speed Calibration procedure, a Speed Run Calibration should be performed. The Speed Run Calibration will ensure that the Log Speed reading is accurate over the vessel’s full speed range.

CalibrationSpeedSpeed calibrationSpeed Run calibration

Prerequisites:

  • SOG data must be available.

  • You will need to be underway, with sufficient space to maneuver unhindered.

  • In order to achieve accurate results, water conditions must be calm with zero tide and zero current.

Note

Speed Run Calibration cannot be performed when the transducer is connected using a Speed Pod.

The steps below detail the method of calibrating speed transducers connected using an iTC-5 or smart transducers (e.g.: DST800).

With a Favorite page displayed:
  1. Press the Menu button.
  2. Select Set-up.
  3. Select Transducers Set-up.
  4. Select Continue.

    The display will search for and show a list of connected devices. (i.e. iTC-5 or DST)

  5. Select the device that is connected to the transducer you are calibrating.

    A list of available transducer data is displayed.

  6. (1)Select Speed.

    (This step is only applicable when calibrating a speed transducer connected via an iTC-5.)

  7. Select Speed Calibration.
  8. Select New cal using SOG.

    CalibrationSpeedYou will need to add calibration points at a range of speeds spanning the full speed range of the vessel. Conventional transducers can have up to 5 calibration points and smart transducers can have up to 8. Ideally the calibration points should be taken at regular increments throughout the speed range, with the last calibration point being close to the vessel’s top speed.

    With the Speed Transducer connected to a Speed Pod, the 5 calibration points are fixed in sequence at 2, 4, 8, 16 and 32 knots. When adding calibration points during the Speed Run Calibration, ensure vessel speed is as close to the fixed calibration point speeds as possible, as the calibration factor applied will be the difference between the actual vessel speed and the fixed calibration point speed.

  9. Select Start.
  10. Ensure the vessel’s speed is steady at your first calibration point speed and select Add.
  11. Repeat step 10 for all remaining calibration points, ensuring that the calibration points are equally spaced throughout your vessel’s speed range from stationary to top speed.

    Once all calibration points have been successfully added, the Calibration complete message is displayed.

  12. Select OK.