A method for forming a wire in a layer based on a monocrystalline or amorphous material. By using the index obtained, correction values for correcting position and orientation measured values are calculated. Triggering of the comparator causes the converter to enter a non-switching sleep mode, whereby the output voltage droops over a period of time. To merge maps, the coordinate system of each system may be constrained in degrees of freedom using information from sensors on the devices to determine the global position and orientation of each device.