Tracking method for determining the position of a mobile measuring station in relation to a base station in an interior space: repeated turning or swivelling of a bundle with at least one light beam around at least one axis of the base station in directions of emission changing according to a preset sequence for producing a wandering pattern made of points of light on a wall of the interior space; drawing a series of pictures of a wall of the interior space, keeping the same direction of view of a camera of the mobile measuring station, in which one of the wandering points of light is mapped onto at least three different image points (P1, P2, P3) in the series; determining the image coordinates (x1, y1; x2, y2; x3, y3) of the at least three different image points (P1, P2, P3); determining the at least three directions of emission of the light beams, the points of light of which are mapped onto one of the at least three different image points (P1, P2, P3) at one time in one of the pictures, based on the times when the relevant picture is drawn, establishing the at least three distances (d1, d2, d3) of the axis of the base station from the wall in the at least three directions of emission, based on measurements of distance from the wall in directions of measurement going out from the base station stored in a reference data base; determining the position of the mobile measuring station, based on the image coordinates (x1, y1; x2, y2; x3, y3) of the at least three image points (P1, P2, P3), the directions of emission belonging to the image points (P1, P2, P3) and the relevant distances (d1, d2, d3) of the base station from the wall in the directions of emission belonging to them. repeated turning or swivelling of a bundle with at least one light beam around at least one axis of the base station in directions of emission changing according to a preset sequence for producing a wandering pattern made of points of light on a wall of the interior space; drawing a series of pictures of a wall of the interior space, keeping the same direction of view of a camera of the mobile measuring station, in which one of the wandering points of light is mapped onto at least three different image points (P1, P2, P3) in the series; determining the image coordinates (x1, y1; x2, y2; x3, y3) of the at least three different image points (P1, P2, P3); determining the at least three directions of emission of the light beams, the points of light of which are mapped onto one of the at least three different image points (P1, P2, P3) at one time in one of the pictures, based on the times when the relevant picture is drawn, establishing the at least three distances (d1, d2, d3) of the axis of the base station from the wall in the at least three directions of emission, based on measurements of distance from the wall in directions of measurement going out from the base station stored in a reference data base; determining the position of the mobile measuring station, based on the image coordinates (x1, y1; x2, y2; x3, y3) of the at least three image points (P1, P2, P3), the directions of emission belonging to the image points (P1, P2, P3) and the relevant distances (d1, d2, d3) of the base station from the wall in the directions of emission belonging to them.