1216. A group of muggleborn students become increasingly frustrated with all the hallways and corridors, so they get a full map of the school and charm to act like a GPS, voice and everything. Soon, many students, from pure-blood to muggleborns, want one, and they start a business. Voices soon become customizable, so the voice could be your own, that of a family member, or a celebrity, wizard or not. Maps also become smaller and customizable. Others start making small protective sleeves for them.