iwc Fliegeruhr Worldtime Mode D'emploi page 29

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t z c ( t i m e z o n e c o r r e c t o r )
Local times throughout the world are, for the most part, divided
into time zones with a time difference of exactly one hour between
each zone. The function of the TZC (Time Zone Corrector) permits
rapid adjustment of the time display in one-hour steps.
r e a d i n g t h e 2 4 - h o u r W o r l d t i m e d i s p l a y
By the rotating 24-hour ring and the fixed city ring, your watch
shows the current UTC time and the current time of day in all
other time zones separated by a full hour.
p i l o t ' s W a t c h W o r l d t i m e r