Audemars Piguet royal oak offshore alinghi polaris Instructions For Use Manual - page 10
4.4 Flange function
4.4.1 Countdown (or timer) function
With the countdown function, you can, without starting the
chronograph, measure a period of up to 60 minutes using the
rotating flange and the minute hand. To activate this function :
1
Unscrew crown E, it releases the flange which you can now
rotate.
2
Position the desired duration, for example 20 opposite the
minute hand (2). The time will have elapsed when the
minute hand reaches position N (= 0) on the flange.
4.3.5 Fourth warning signal, crossing the start line
This is the signal giving the green light to officially cross the
start/finish line. It is shown by counters 4, 5, 6 and 7. From this
moment on, the chronograph can be left to follow the race after
activating the flyback function to zero all counters.
(6)
(5)
(4)
(7)
(2)
(E)