iwc AQUATIMER AUTOMATIC 2000 Operating Instructions Manual page 28

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M a r k i n g t h e s t a r t O F a d i v e
The triangle on the internal rotating bezel can be aligned with the
minute hand by turning the external rotating bezel. The desired
point in time (for example the time of entering the water at the
start of the dive) can be set in this way. You can read off the
elapsed time (for example the duration of the dive) on the internal
rotating bezel. For safety reasons, the internal rotating bezel can
only be rotated in an anticlockwise direction. The rotating bezel is
indexed audibly and perceptibly in one-minute steps, and it is also
legible in the dark thanks to the luminescent markings.
If you are planning to use the watch to time dives, you should
be a certified open water diver and have the water­resistance
of your watch checked regularly by an IWC service centre.
A q u A t i m e r A u t o m A t i c 2 0 0 0