I can only defer to those who actually understand ALL the implications of any watch-keeping system. Just a question - does the LATCC en-route pattern of AAOMMNNSOO then AAOMMDDOOO comply? Of course, it is a rare event for anyone to work the "usual" pattern of alternating days and nights - personal preferences and rostering requirements see to that. I hope that the experts will be keeping a very careful eye on the goings-on during OCT next year (if it happens).