Calibrating the Navigator box for use with an odometry sensor - SharpX X1S, X2S, XSU

AutoVu™ Navigator box Technote

SharpX X1S, X2S, XSU

In an AutoVu™ system that includes an external Navigator box, if you replace the magneto coil with an odometry sensor, you must recalibrate the system to ensure that system odometry is accurate.

What you should know

A “tick” is a pulse generated by the vehicle, typically by the transmission or drive shaft, whose frequency is proportional to the vehicle’s velocity. Because all vehicles have a different tick frequency, you will calibrate the Navigator box to know your vehicle’s specific tick frequency.
IMPORTANT: This procedure is best performed with two people: one to drive the patrol vehicle, and the other to use IO Services.


  1. With Genetec Patroller™ running on the in-vehicle computer, stop the vehicle, but keep the engine running.
  2. On the in-vehicle computer, in the Windows system tray, right-click the Genetec Patroller™ icon and click IO Services.
    The IO Services window opens.
    NOTE: If the NavBox module does not appear in the window, verify the port number for the Navigator box in the Windows device manager.
  3. Click Actions > Odometry > Calibrate.
    The Odometry calibration window opens.

  4. In the Noise field, enter 240. This is the recommended setting when using an odometry sensor.
  5. At the bottom of the dialog box, verify the Ticks.
    While stopped and monitoring, turn on the vehicle’s electronics, for example, emergency flashers, turn signals, and window wipers. Shift from Park to Reverse to Drive and back to Park. The ticks should not increase (one tick is acceptable).

    If the ticks are changing, increase the Adjust noise suppression value to the lowest value that doesn't inject ticks while the vehicle is stopped.

    NOTE: Increasing this value filters more noise, but setting the value too high could also affect the detection of ticks at low speed.
  6. Start driving and take note of the number on the vehicle’s odometer, or reset the vehicle’s trip meter. You will need to enter the distance you traveled as part of the calibration.
  7. Click Start calibration.
  8. Drive a distance of least 1 km (0.5 mi.).
    Best Practice: To get the most accurate odometry reading, drive 2 to 4 km (1 to 3 mi.).
  9. Pull to the side of the road, stop the vehicle, then click End Calibration.
    The Distance traveled dialog box appears.

  10. Enter the distance you traveled, then click OK.
    The Odometry calibration window appears.

  11. From the Odometry calibration window, take note of the value in the Scale field.
    The Scale is used to align the GPS and odometer speed readings. You will need to enter this scale value in Patroller Config Tool.
  12. Click OK.
  13. Verify that no wheel ticks are registered when the vehicle is idle.
  14. Validate the calibration as follows:
    1. Start driving at a consistent speed of 80 km/h (50 MPH).
    2. For best performance, the GPS speed indicated in the IO Services window should be within 5% of the vehicle’s Odometry (for example, within 4km/h at 80 km/h).
      If the difference is greater than 5%, run the calibration again to see if the results improve.
      If the difference is still greater than 5%, the system can still function, but with reduced navigation performance. Contact the AutoVu™ Support team for assistance.
      In this example, the GPS and Odometry speeds are within 5%.

  15. On the in-vehicle computer, open Genetec Patroller™ Config Tool, go to Navigation > Odometry, enter the scale number from Step 11 in the Scale field, then click Apply.