Tour guides may use microphones, video cameras, maps, guide books and display photos or diagrams in their work. They may also use commentary notes that they write themselves and memorise, as well as information handouts for visitors on their tour. If they conduct long tours, they may also need to drive a bus or coach and use equipment for cooking, navigation and setting up camp sites. They are frequently required to wear a uniform or special clothing that protects them from harsh weather conditions and assists them in walking, trekking and other tour activities.