Unmanned Aerial Vehicles or UAVs are tremendously flexible devices, and can be used for a variety of purposes. For example, they can be used to provide entertaining videotaped scenes to movie-makers, news reporters and the tourism industry; to search for and rescue people in perilous locations or circumstances (collapses, spills and fires); and to monitor or deliver mail to important installations in either highly sensitive locations (borders, ports and power-plants) or remote or uninhabitable places (polar zones, deserts and off-shore oil rigs). UAVs can also be used for the gathering of scientific data, as the mission below represents.