Navigation Computer: Calibration

Calibration is required after initial installation or replacement of the navigation computer. It may also be necessary after repairs to system wiring and if route navigation becomes inaccurate or fails to operate. If the navigation computer contains an existing calibration, this must be deleted, using the garage menu, prior to running the new calibration routine. The sensor inputs should also be checked before running the calibration routine.

Sensor Check 

1. Call up the SENSORS screen on the LCD:
   1. If the navigation CD-ROM has not been installed before, press and hold multifunction button 1 then press multifunction button 10.
   2. If the navigation CD-ROM has been installed before, use the garage menu as detailed above.
2. Drive the vehicle forwards a short distance at a speed greater than 2.5 mph (4 km/h) and ensure the road speed counter on the SENSORS screen starts to increment.
3. Select reverse gear and ensure the direction arrows on the SENSORS screen point rearwards.
4. Ensure the GPS data on the SENSORS screen is displayed and updated.
   NOTE: The GPS data will randomly display a GPS MODULE FAILURE message. This is not a fault condition, and no action need be taken, provided the GPS data switches between the GPS MODULE FAILURE message and actual GPS data.
5. Exit the SENSORS screen:
   1. If the navigation CD-ROM has not been installed before, press and hold multifunction button 1 then press multifunction button 10.
   2. If the navigation CD-ROM has been installed before, press the Nav button.

Calibration Routine

1. Park the vehicle outside in an area clear of high buildings, trees etc.
   NOTE: The more open the surrounding area is, the faster the system will acquire sufficient GPS satellite signals to begin calibration. To minimize the calibration time, the vehicle should not be moved again until the calibration ride.
2. Turn the ignition switch to position II. If the navigation computer does not come on, press the navigation computer ON button.
3. If necessary, use the navigation computer multifunction buttons to enter the security code.
4. Turn the ignition switch to position 0 and remove the ignition key.
5. Press the navigation computer ON button.
6. Call up the SENSORS screen on the LCD:
   1. If the navigation CD-ROM has not been installed before, press and hold multifunction button 1 then press multifunction button 10.
   2. If the navigation CD-ROM has been installed before, use the garage menu as detailed above.
7. Turn the LH rotary control to minimum volume.
8. Wait for 30 minutes. If necessary, the vehicle can be left unattended and locked.
   NOTE: Land Rover recommend a minimum of 30 minutes be allowed to elapse in order to ensure that only a short distance need be driven to achieve calibration.
9. After the 30 minutes have elapsed, ensure the navigation computer LCD shows a GPS almanac figure of 27 or higher.
10. Start the vehicle engine and allow to idle.
11. Install the navigation CD-ROM.
12. Wait until the navigation computer LCD prompts for a language to be selected. Turn the RH rotary control to scroll through the options, highlight the required language and press the RH rotary control to select.
13. The navigation computer LCD will prompt for a voice to be selected. Turn the RH rotary control to scroll through the options, highlight the required voice and press the RH rotary control to select.
14. Wait until the navigation computer LCD advises "language has been loaded OK". Press the RH rotary control to confirm the language and voice selections.
15. The navigation computer LCD will default to the CALIBRATION RIDE screen and should show the CALIBRATION RIDE CAN START message. The GPS data and the road speed counter will also be shown.
16. Drive the vehicle over a road route approximating that shown below (it is not necessary to copy the route exactly). Calibration is complete when the navigation computer LCD switches to show DESTINATION & POI and the satellite graphic. If all the pre calibration ride conditions were complied with, calibration is typically achieved within 3 miles (5 km) and usually occurs when the vehicle returns to the start point. However, calibration may be achieved earlier in the journey and, if it is, there is no need to complete the remainder of the calibration route.
17. After calibration is achieved, return to the dealership, park the vehicle and stop the engine.
18. Turn the ignition switch to position I.
19. Use the system settings menu to set the navigation computer to local time and the required units of measure:
    1. Press the Nav button.
    2. Turn the RH rotary control to scroll through the displayed menu, highlight TIME and press the RH rotary control to select. Press the + or - multifunction button to adjust the time in 30 minute steps. Select the 24 hour clock and confirm by pressing the OK multifunction button.
    3. If metric units of measure are required, go to step e) (the navigation computer defaults to metric units of measure).
    4. If Imperial units of measure are required, turn the RH rotary control to scroll through the displayed menu, highlight MEASURING UNIT and press the RH rotary control to select. Turn the RH rotary control to highlight IMPERIAL and press the RH rotary control to select.
    5. Press the Nav button to return to the destination menu.
20. Calibration is complete. The navigation system is ready for use.

Fig 1: Navigation System Calibration Diagram

Courtesy of LAND ROVER NORTH AMERICA, INC.