Compression Keys; Important Notice - Jaeger-leCoultre Master Compressor Diving Pro Geographic Navy SEALs User Manual

Compression keys

The compression key fitted on the crowns of Master
Compressor line watch models is a patented system which
enables additional compression of one of the 4 crown gaskets,
which boosts your watch's water-resistance in the long term.
The "open" or "closed" position of the compression key is
indicated by the arrow symbols (viewed from the front):
- The compression key is in the compressed gasket posi-
tion ("closed") if the indicator shows only one arrow; the
keys must be closed when you are wearing your watch and
when you are taking part in sports. You must not make any
adjustments or set the time in this position, since this might
damage the gaskets.
- The compression key is in the non-compressed gasket
position ("open") if the indication is represented by two
arrows; in this configuration, you can start the watch and
set the functions as per the explanations below.
Compressed gasket position or Non-compressed gasket position
"closed" position
The transition from the "closed" to the "open" position, or
vice-versa, is performed by turning the key using the wing-
nuts in the direction indicated by the arrow(s).
Note
The water-resistance function of the compression key is
separate from the operation of the crown itself. Even in the
closed position, the key does not lock the crown. So in practice
it is possible to handle the crown when the key is in the
compressed gasket position. However, as mentioned earlier,
it is extremely inadvisable to make settings in this position,
since this might damage the gaskets. We recommend that
you first turn the compression key to the "open" position
before making any settings on your watch.
The switch from the "closed" to the "open" position, or vice-
versa, is made by turning the key using the wing-nuts in the
direction indicated by the arrow(s).
Master Compressor Diving,
divers' watches meeting the NIHS 92-11
(ISO 6425) standards
Master Compressor Diving line watches, which bear the
title "diving watches", satisfy the requirements of the Swiss
Watchmaking Industry Standard (NIHS) 92-11, reproducing
the European standard ISO 6425.
Notice
As a precaution, please note the following two recommenda-
tions:
- You must not operate the crowns in water,
- You must not use Master Compressor Diving watches for
deep dives (diving with a gas mixture, in which the diver
spends alternating periods between the water and a pres-
surised chamber), or at a depth greater than that indicated.
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or "open" position
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Important notice:

Elementary rules for diving – Diving with the Master
Compressor Diving Pro Geographic watch:
Please note the following points:
- Dives must be performed under your own responsibility,
and in accordance with the elementary rules of diving. There
are certain risks inherent in this activity, such as accidents or
unforeseen physiological reactions. You need to be a holder
of a diving certificate, or make the dive as part of diving
training dispensed by specialised professionals, and be fully
equipped for this activity to ensure your own safety. Sports
diving in special environments, known as "technical diving",
requires special techniques and equipment (gas mixtures,
rebreathers, etc.) and a formal safety approach, which can
only be provided by diving professionals.
- Never dive alone; your watch is under no circumstances a
substitute for a diving professional.
- Always dive with at least two depth gauges (instruments
measuring depth), including one professional diving compu-
ter with electronic depth gauge. Diving computers indicate
multiple parameters such as the body's nitrogen level, cal-
culate decompression stops or measure water tempera-
ture, etc. They will always be the most suitable technology
for providing accurate multi-purpose tools for diving. It is
utterly inadvisable to use the Master Compressor Diving
Pro Geographic watch without a diving computer as a pri-
mary tool. Furthermore, any use of a mechanical depth
gauge requires perfect knowledge of the laws governing
the use of diving tables, as the safety rules applicable for
these are the same as for diving with a computer.
- Any opening or technical service manipulation of the
Master Compressor Diving Pro Geographic watch case
must be verified by an authorised Jaeger-LeCoultre retailer.
Furthermore, before any period of intensive use, your
watch must undergo a check-up by an authorised Jaeger-
LeCoultre retailer.
Maximum depth and water-resistance
The Master Compressor Diving Pro Geographic watch is
water-resistant to 30 atm (approximately 300 metres).
The depth gauge on the Master Compressor Diving Pro
Geographic watch indicates depths from 0 to 80 metres.
Please note that taking the watch down below 80 metres
does not pose any danger to the depth gauge mechanism. In
this case, its hand stops just after the '80' mark on the scale.
The mechanism has a stop that halts the indicator in this posi-
tion. Once the watch returns to a depth of 80 metres, the
indicator hand will start moving again, according to the depth
measured, up to zero metres.
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