Mr. Alan Brereton:

There are different categories for night time. As people progress on the journey to becoming a professional airline pilot, an airline transport pilot or a rescue helicopter pilot, they can use what are called instrument flight rules, which in very simple terms allow us to fly in cloud. Under those rules we are more reliant on the instruments in the flight deck. A VFR pilot will rely on the instruments to actually operate the aircraft but not necessarily to navigate. He or she will use the maps. If I could have that map for a second to show the members, every pilot who is flying around Ireland today on visual flight rules has this map sitting on his or her knee.