911215 Adjusting (calibrating) PCM navigation unit · General The gyroscope shows tempera

911 Carrera (996) Radio, telephone, on-board computer, navigation 911215 Adjusting (calibrating) PCM navigation unit General The gyroscope shows temperature-dependency. This temperature-dependencyis compensatedThe PCM navigation unit must be calibrated after by the system if the "cold" (not calibrated)maintenancework or commissioning.Calibration is the prerequisite for exact route guidance. system is switched on and left to stand for approx. one hour. The following components of the PCM navigation Note: unit must be calibrated or initialised: The gyroscope must be calibrated after GPS receiver: After an interruption in the commissioningonly. If a system that has power supply (terminal 3D), the installed GPS already been calibrated is disconnectedfrom receiver loses its so-called almanac.The the power supply(terminal 30).,the calibration almanac stores the satellite orbits and of the gyroscope is retained. ensures fast location of the individual satellites when the system is started. Procedure after commissioning: Pleaseobserve the sequence! Distance sensor: The distance sensor transmits the distance travelled to the PCM Switch on the PCMwith a free panoramic navigation unit. The distance signal changes view for approx. 20 minutes (to load GPS if the circumference of the tyre changes almanac). (e.g. tyre change). This modification must be calibrated by the PCM navigation unit Drive on a motorway if possible at a afterwards. speed greater than 60 km/h for a distance of approx. 50 km (calibration Note of the distance measurement). The distance sensor must be calibrated after commissioning of the PCM navigation unit or Drive approx. 10 km in an urban area after changing a tyre. If a system that has and take frequent turn-ofts. Stop for already been calibrated is disconnectedfrom approx. 10 seconds occasionally the power supply (terminal 3D), the calibration (calibration of the gyroscope). of the distance sensor is retained. Switch on the PCM navigation unit for Gyroscope: The gyroscope detects approx. one hour with the vehicle changes in the direction of travel and horizontal(temperature compensation must be calibrated after commissioning. of the gyroscope). 91 12 15 Adjusting (calibrating) PCM navigation unit 91-15 Printed in Germany -23, 1999 9969115