IWC Schaffhausen AQUATIMER AUTOMATIC 2000 Mode D'emploi page 25

Marking the start of a dive
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Rotation of the adjustment crown in a clockwise direction
causes the bezel to rotate in the case, enabling the
triangle on the bezel to be aligned with the minute hand.
The desired point in time (e.g. 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 (e.g. the duration of
the dive) on the bezel. For safety reasons, the bezel
can only be rotated in an anti-clockwise direction. The
audible and perceptible indexing of the bezel takes
place in steps of one minute, and it is also legible in the
dark thanks to the luminous markings.
The use of the watch as a timer when diving requires
an appropriate diving sport training and regular
inspection of the water-resistance of the watch.
Cleaning the watch after diving
After diving – and especially after diving in seawater –
you should rinse your watch under flowing mains water.
This will prevent salt incrustation on the case, bracelet
and clasp.