Abstract: The present disclosure provides a surveying instrument. The surveying instrument comprises a center unit comprising an optical device and a front lens. The optical device is arranged to emit and/or receive light through the front lens along an optical axis (OA) of the center unit. The surveying instrument further comprises an alidade on which the center unit is rotatably arranged about a first axis (A1). The alidade comprises a tilt sensor arranged along a second axis (A2). The second axis is orthogonal to the first axis. The alidade further comprises an optical arrangement arranged to form an optical path from a first side of the alidade to an aperture arranged along the second axis at a second side of the alidade. The optical path bypasses the tilt sensor.

Abstract: The present inventive concept relates to a target for use in surveying applications, said target comprising: a base element having a central axis, a reflector for reflecting light beams being incident on said target, said reflector including a plurality of retroreflectors arranged around said central axis to cover an angular area of substantially 360 degrees, wherein said reflector has an outer circumference and an inner circumference as defined by the arrangement of the retroreflectors and wherein a retroreflector has a first side located at the outer circumference and a second side located at the inner circumference; and a plurality of light emitting elements providing a plurality of apparent light sources arranged around said central axis, wherein an apparent light source is positioned within the inner circumference of the reflector for emitting light in a direction away from the central axis of the base element.