GM1 ORO.FTL.105(2) Definitions
CAA ORS9 Decision No. 1
(a) Reference time refers to reporting points in a 2-hour wide time zone band around the local time where a crew member is acclimatised.
(b) Example: A crew member is acclimatised to the local time in Helsinki and reports for duty in London. The reference time is the local time in London.