Manual

3. SETTING THE ALTIMETER
(Crown position 2): Pull the crown
out to position 2 and set the alti-
meter by rotating the crown. There
are different modes of settings,
such as rotating the crown until
the reference air pressure QNH/
QFE/QNE (e.g. supplied by an
airport control tower) aligns with
the red triangle at 6 o‘clock on the
central dial, or rotating the crown
to adjust the yellow indicator to
your known altitude. The watch
now displays the present altitude,
yellow indicator, and the actual
atmospheric pressure, red
indicator.
4. MEASURING ALTITUDE
(Crown position 1): Once the
altimeter has been set, push the
crown into position 1. Changes in
altitude are shown by the yellow
indicator against the outer dial
ring, on a scale from 0 – 15’000
feet, or from 0 – 4’500 metres.
GUIDELINES
Each Oris Big Crown ProPilot
Altimeter has been tested and
found to comply with the Oris
testing standards. It is possible
that due to physical damage,
inadequate handling or uncon-
trollable influence, the altitude
and air pressure indication may
not function properly. These
guidelines will help to make the
Oris Big Crown ProPilot Altimeter
the best possible companion.
Accuracy of the Altimeter
The following parameters interact
with the functional principle and
the barometric functionality of the
Oris Big Crown ProPilot Altimeter
and may slightly influence the
accuracy of the altitude indication:
Change of atmospheric pressure
due to different temperatures
Change of atmospheric pressure
due to different temperature
gradients at different locations of
reading the altitude
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Changing weather conditions,
such as high pressure systems/
low pressure systems
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Weather dynamics in general
Safety Precautions Prior to Use

Ascertain that the Oris Big Crown
ProPilot Altimeter has ambient
temperature, i.e. that it has not
been exposed to extreme sunlight
or other heat or cold before the
use.

Make sure that the crown at
4 o’clock is unscrewed and in
position 1 as described in the
section «How to use the Oris
Big Crown ProPilot Altimeter».
The red ring on the crown shaft
must be clearly visible. The alti-
meter does not work if the crown
is screwed in to the case.

Prevent the watch from getting in
contact with water once the crown
at 4 o’clock is unscrewed. The
case is open and not water resist-
ant when the crown at 4 o’clock is
not tightly screwed into position 0.
The special PTFE membrane only
ensures a protection against
water-vapour and humidity
entering into the watch. The
membrane does not ensure any
water-resistance.

Avoid dirt from coming into contact
with the watch. Dirt might block
the PTFE membrane and the case
openings and as a consequence
disable any free circulation of air
into/out of the case. The display
of the altitude will then be delayed
or completely out of operation.

Always tickle with your fingertips
on the watch before reading the
correct altitude. The smooth tick-
ling allows the aneroid cell and
the mechanism of the barometric
altimeter to work smoothly.

Always adjust the altimeter before
using according to the instruc-
tions given in the section «How to
use the Oris Big Crown ProPilot
Altimeter/setting the altimeter».

Check and recalibrate the alti-
meter frequently, whenever having
a reference point indicating its
altitude or a given reference pres-
sure in order to compensate for
changing ambient and weather
conditions.

For safety reasons: Use the Oris
Big Crown ProPilot Altimeter in
flight operations or on expeditions
only as a secondary instrument
in addition to any other device
indicating altitude, e.g. on-board
instruments of a plane.
Note: Pressurized aircraft cabins
simulate an environment of a
lower altitude than the airplane
is actually flying. Every baromet-
ric altimeter, be it electronic or
mechanical as the Oris Big Crown
ProPilot Altimeter, indicates the
current air pressure in the cabin
when flying with air carriers. The
altimeter instruments in such air-
planes have a pressure connec-
tion on the exterior of the plane
in order to measure pressure and
altitude.
Oris declines any responsibility
if these instructions are not
followed. The international
guarantee applies as stated in
the Oris Product Manual supplied
with each Oris watch and availa-
ble on www.oris.ch.
How to use the Oris Big Crown
ProPilot Altimeter
The dial is split into three zones –
in the centre is a traditional watch
dial showing the time; around that
is a gauge showing atmospheric
air pressure, read using the red
indicator; and an outer ring dis-
plays altitude up to 15’000 feet
or 4’500 metres, shown by the
yellow indicator.
1. NEUTRAL MODE
(Crown position 0): With both
crowns screwed down securely,
the Big Crown ProPilot Altimeter
performs like a regular auto-
matic watch. The central dial and
hands tell the time and date (ad-
justed by the crown at 2 o’clock)
and the watch is water-resistant
to 100 metres/10 bar.
2. ACTIVATING THE ALTIMETER
(Crown position 1): Unscrew the
crown at 4 o’clock into position
1 to activate the altimeter. A red
ring appears, indicating that the
altimeter is in use.
5. RETURNING TO NEUTRAL
(Crown position 0): To deactivate
the altimeter and return it to
neutral, screw the crown back
into position 0. This also re-seals
the watch so that it is once again
water-resistant to 100 metres/
10 bar.
English