Aviation survival can cover a wide range of topics that include many of the issues addressed in Global Survival. Pilots and aircrew members also need to know how to dress for the aviation environment, how to build and use an aircraft survival kit, how to deal with in-flight emergencies and immediate post-crash factors, how to signal distress and other issues related to aviation. In addition, those who fly over water require training in ditching procedures, underwater escape and use of auxiliary breathing devices, emergency floatation, raft management and survival at sea.