Abstract: The invention relates to a method for calibrating a GNSS antenna of a vehicle, wherein a calibration process is performed that involves the vehicle being moved such that the horizontal and/or vertical orientation of the vehicle changes, a respective elevation- and azimuth-dependent error correction for the GNSS antenna being ascertained for different horizontal and/or vertical orientations.

Abstract: The invention relates to a method for ascertaining a position of a first mobile apparatus, wherein a position finding device uses a GNSS to ascertain the position of the first mobile apparatus based on a propagation time measurement for GNSS signals of different GNSS satellites that are received by a GNSS receiver of the first mobile apparatus, characterized by ascertainment of at least one piece of error information of the GNSS from the GNSS signals of different GNSS satellites that are received by a GNSS receiver provided on at least one second mobile apparatus at a reception position of the second mobile apparatus, by an error determination device, transmission of the ascertained error information of the GNSS to the position finding device of the first mobile apparatus, and ascertainment of the position of the first mobile apparatus by the position finding device taking into consideration the error information of the GNSS ascertained at the reception position of the at least one second mobile apparatus