Diving At High Altitude And In Freshwater - Citizen C520 Instruction Manual

< During diving >
• Avoid ascending very quickly to prevent your body from being affected by
the bends, etc. Surface at a safe speed of within 9m/30ft. per minute.
This ascending speed is in accordance with the U.S. Navy Diving Manual
(1993 edition).
• Never operate the crown or any buttons except button
Doing so may result in a fault such as poor water resistance.
• Be careful because the alarm may be hard to hear underwater because of
the sound of your breathing.
< After diving >
• After making sure that the crown is locked in place, wash the watch free of
seawater, mud and sand using fresh water, then wipe the water off with a
dry cloth.
• Do not attempt to remove the sensor cover and remove any dirt or debris
clogging the sensor with a sharp instrument. If there is any debris, flush it
out with fresh water. If you cannot do so, consult a Citizen Service Center.
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• Be sure to complete special safety training before diving in fresh water or at
A
when underwater.
• Do not use this watch at altitudes over 4,000 meters (13,124ft), because
• This watch displays change in depth based on a standard of seawater (den-
CAUTION
DIVING AT HIGH ALTITUDE AND IN
FRESHWATER
high altitude.
accurate measurement is not possible.
sity 1.025), so the actual depth in fresh water will be 2.5% greater than the
depth displayed.
Example: 20m/66ft (indicated depth) X 1.025 = 20.5m/68ft (actual depth)
The pressure sensor is calibrated to the surrounding pressure at a depth of
0m (0ft) when the watch is switched to Diving Modes. Sealevel is also set to
0m (0ft) when the watch is switched to Diving Modes in a lake at high
altitude. However, do not use at an altitude of over 4,000m (13,124ft)
because accurate measurement is not possible.
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