A Single-bolt Auxiliary Light Bracket is disclosed. The level detection unit compares a reference voltage with a division voltage of a pumping voltage, detects a level of the pumping voltage according to the comparison result, and generates a level detection signal. The method further includes mapping the extracted reference feature information to the graphical representation of the bone, receiving information indicative of a positional landmark associated with the bone, and estimating an intersection between the positional landmark and the mapped reference feature.