A surveying instrument, for acquiring three-dimensional measuring points with respect to an inner coordinate system of the surveying instrument, having • a measuring unit defining the inner coordinate system and comprising: □ a support mounted on a base and rotatable relative to the base about an azimuth axis, □ an emitting unit for providing a transmission beam (T), □ a receiving unit for detecting a reception beam (R), □ a beam directing unit mounted in the support, rotatable relative to the support about an elevation axis, and configured for • directing the transmission beam from the emitting unit towards a scene, • directing the reception beam from the scene to the beam receiving unit, • a projector configured for projecting a light pattern onto a surface in the scene, wherein the pose of the light pattern is definable relative to the inner coordinate system, and • an instrument computer configured for □ controlling the measuring unit and the projector, □ referencing the inner coordinate system relative to a reference system based on measurement data obtained with the measuring unit, characterised in that the projector is configured for providing a referencing marker as the light pattern, wherein the referencing marker is assigned to the reference system and is designed to allow Augmented Reality (AR)-devices, comprising a visual sensor, to reference their pose relative to the reference system by capturing the referencing marker by means of the visual sensor. • a measuring unit defining the inner coordinate system and comprising: □ a support mounted on a base and rotatable relative to the base about an azimuth axis, □ an emitting unit for providing a transmission beam (T), □ a receiving unit for detecting a reception beam (R), □ a beam directing unit mounted in the support, rotatable relative to the support about an elevation axis, and configured for • directing the transmission beam from the emitting unit towards a scene, • directing the reception beam from the scene to the beam receiving unit, □ a support mounted on a base and rotatable relative to the base about an azimuth axis, □ an emitting unit for providing a transmission beam (T), □ a receiving unit for detecting a reception beam (R), □ a beam directing unit mounted in the support, rotatable relative to the support about an elevation axis, and configured for • directing the transmission beam from the emitting unit towards a scene, • directing the reception beam from the scene to the beam receiving unit, • directing the transmission beam from the emitting unit towards a scene, • directing the reception beam from the scene to the beam receiving unit, • a projector configured for projecting a light pattern onto a surface in the scene, wherein the pose of the light pattern is definable relative to the inner coordinate system, and • an instrument computer configured for □ controlling the measuring unit and the projector, □ referencing the inner coordinate system relative to a reference system based on measurement data obtained with the measuring unit, □ controlling the measuring unit and the projector, □ referencing the inner coordinate system relative to a reference system based on measurement data obtained with the measuring unit, <EOS>