 Issue 4 each year is the "Annual Training Sourcebook" (or "Yearbook") and differs from the regular issues by incorporating additional content including a "Year in Review" article (a round-up of industry highlights over the past 12 months) and the "Civil Full Flight Simulator Census".The 'Sim Census' provides information on more than 1,200 civil full flight simulators in use worldwide, with a summary of technical data which includes motion systems, image generators, display systems and approval level.Since 1998, "CAT" has organised over 30 civil aviation training-related conferences worldwide to accompany the magazine.