Servus, I’ve just installed an AVIC X1R in an Astra G. Unfortunately it shows some flaws. – The position is always displayed a few hundred meters offset. I’m not 100% sure, but I always think south. – The speed is displayed incorrectly, good 15% too little. My speedometer always agrees with other Navis quite well. – The Navi shows on the map the planned route in green: the road following straight ahead, at the end of the road to the left and then following the road again. However, the announcement “turn right” paired with an arrow to the right. And on the right there are not even side roads. I once deleted all the calibrations under Settings – Device Info – Sensor Status (or so similar) under Settings – Sensor Status (or so similar) . The covered path counts high there. The tacho impulses however not, or only very slow. On about 30km came only 4 impulses. Can this be so correct? Shouldn’t that shoot with several impulses per wheel rotation into the height? The tacho signal – must have been connected correctly, that I’ve accessed the pin of the iso-red.