ICAO Doc 4444
12.3.2.9 Instructions Associated with Flying a Track (OFFSET), Parallel to the Cleared route
a) ADVISE IF ABLE TO PROCEED PARALLEL OFFSET;
b) PROCEED OFFSET (distance) RIGHT/LEFT OF (route) (track) [CENTRE LINE] [AT (significant point or time)] [UNTIL (significant point or time)];
c) CANCEL OFFSET (instructions to rejoin cleared flight route or other information).
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