Patent ID: 8225518

Claim:
A manual surveying instrument including a collimation assist device having a collimation light transmitting system that emits a collimation light along a collimation axis toward a target installed at a measurement point, an area sensor that obtains an image of a scene captured within a field of view of a collimating telescope, a display unit that displays the image, a collimation light detecting unit that detects the target as a result of receiving the collimation light reflected on the target by the area sensor, and an arithmetic control unit that displays an area indicating being within a predetermined deviation from the collimation axis and a symbol indicating the target on the display unit as an animation image, judges that collimation has been completed when the target has been captured, by a manual operation of the collimating telescope, within the area indicating being within a predetermined deviation from the collimation axis to perform an angle measuring operation, and corrects an angle measurement value according to a deviation from the collimation axis of the target.