In the above example, 33 minutes
have elapsed since the start of
measurement.
Rotating bezel for measuring time
to the nearest hour:
Position the marker on the
rotating bezel opposite the hour
hand, or to the desired hour end
position.
The hours elapsed, or the hours
past the preset end time can be
read on the bezel.
Helium valve.
0
Watches with a helium valve are
intended for divers who spend
extended periods on board a
diving bell, or in any other cham-
ber with a helium-enriched
atmosphere.
The inert gas helium has one of
the smallest molecules, meaning
that it can penetrate the seals on
watches and enter the case. Once
inside the case, this gas is unable
to escape rapidly enough unless a
special valve is fitted, i.e. the
helium valve. Opening this valve
prevents any excess pressure on
the watch glass from inside
after the ascent. The helium valve
is identified on Oris diving watches
by a coloured spot on the crown.
Before a dive, turn the helium
valve crown clockwise to its limit
stop and close the valve.
Before leaving the diving station,
turn the crown on the helium valve
anti-clockwise as far as it will go
(to open).
Even if the valve remains open,
the watch would still be water-resi-
stant for normal purposes. But for
diving operations of any kind, the
valve must be closed, as descri-
bed above.
Watch as a compass.
Watches with an analogue hour
and minute display can be used
as compass, using the position of
the sun as a guide. This depends
on the sun’s position being clearly
visible, and on the watch showing
the correct time.
If the watch has a graduated
bezel, this can be used to find the
bisector (mid-point).
Remove the watch from your wrist
and turn it until the hour hand is
pointing at the sun.
Determine the bisector (mid-point)
between the hour hand and 12
o’clock. (Between 18.00 and
Start the chronograph function
using pusher 4 as soon as a
visible event occurs.
Press pusher 4 again as soon as
you hear the sound.
In the above example, the
thunderstorm is still at a distance
of 3 kilometres.
Rotating bezel for diving
watches with a 60 minute
graduation.
The rotating bezel on all Oris diving
watches can only be adjusted in
an anti-clockwise direction. This
prevents the measured or set
time from being extended if the
bezel is turned accidentally. This
ensures that the diver has enough
time left to decompress properly.
The rotating bezel on a diving
watch can also be used as a timer
or for any kind of time indication
to the nearest minute or hour, e.g.
parking, cooking, game time, etc.
Rotating bezel for measuring time
to the nearest minute:
Position the marker on the rotating
bezel opposite the current minute
hand position, or to the desired
minute hand end position.
The minutes elapsed, or the
minutes past the preset end
time can be read on the bezel.
19Setting and operating Oris watches.
English
06.00, take the bigger angle bet-
ween the hour hand and 12
o’clock.) This equates to South.
Once you have established where
South lies, the other cardinal
points can be extrapolated from
that.
If the watch has a rotating bezel
with compass graduation, it is
easier to identify all the cardinal
points other than South. With a
watch of this kind, proceed as
follows:
Remove the watch from your wrist
and determine South using the
compass bezel by calculating the
bisector (mid-point) between the
hour hand and 12 o’clock.
Point hour hand at the sun and
determine the cardinal points
using the compass bezel.
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