The present application provides a sensor-based surgery set and a method for determining the position of a holding device for a surgical instrument. The surgery set includes at least one holding device, an initialization station, and a number of sensors. The initialization station has a number of sensor slots, wherein each sensor is assigned to one sensor slot and wherein the initialization station is coupled to a storage unit in which initialization information is assigned to each sensor slot. A number of sensor slots are arranged on the holding device, wherein each sensor slot is assigned to one sensor slot of the initialization station. In an initialization arrangement, a specific number of sensors is in engagement with the sensor slots of the initialization station and are coupled to the storage unit for initialization and data transmission. In use, however, the sensors are in engagement with the sensor slots.