Method for track calibration, characterised in that a) a tachymeter on a tachymeter car continuously takes distance measurements and angle measurements with respect to a reflector on a reflector car and passes them to a data collection unit, b) the reflector car detects measurement values of the track geometry using a twist measurement device, an elevation measurement device and a track gauge measurement device, the data determined on the reflector car being received by a tachymeter car radio antenna, c) the determined coordinates are linked to the measurement values of the track geometry which are determined on the reflector car, and d) a base station is constructed by way of a known fixed point of a reference network, satellite-assisted position determination is carried out, and these position data are transmitted to the tachymeter car, e) the tachymeter car receives data from the base station via a radio link and determines a position of the tachymeter car by differential GPS using a GPS antenna for continuous position measurement by receiving satellite data on the tachymeter car via an evaluation unit, and, from the position data determined at the base station, determines the correction parameters for the measurement of the position of the tachymeter car by means of an evaluation unit, f) the position of the reflector car is determined by way of the corrected position of the tachymeter car, g) the position of the reflector car is linked to the measurement values of the twist measurement device, the elevation measurement device and the track gauge measurement device, and the differences between the target position and actual position of the track geometry are provided in digital or analogue by way of an output device. a) a tachymeter on a tachymeter car continuously takes distance measurements and angle measurements with respect to a reflector on a reflector car and passes them to a data collection unit, b) the reflector car detects measurement values of the track geometry using a twist measurement device, an elevation measurement device and a track gauge measurement device, the data determined on the reflector car being received by a tachymeter car radio antenna, c) the determined coordinates are linked to the measurement values of the track geometry which are determined on the reflector car, and d) a base station is constructed by way of a known fixed point of a reference network, satellite-assisted position determination is carried out, and these position data are transmitted to the tachymeter car, e) the tachymeter car receives data from the base station via a radio link and determines a position of the tachymeter car by differential GPS using a GPS antenna for continuous position measurement by receiving satellite data on the tachymeter car via an evaluation unit, and, from the position data determined at the base station, determines the correction parameters for the measurement of the position of the tachymeter car by means of an evaluation unit, f) the position of the reflector car is determined by way of the corrected position of the tachymeter car, g) the position of the reflector car is linked to the measurement values of the twist measurement device, the elevation measurement device and the track gauge measurement device, and the differences between the target position and actual position of the track geometry are provided in digital or analogue by way of an output device.