Casio 3377 Owner's Manual
MO0402-EA
Operation Guide 3377
Getting Acquainted
Congratulations upon your selection of this CASIO watch. To get the most out of your
purchase, be sure to carefully read this manual and keep it on hand for later reference
when necessary.
The pressure sensor of this watch provides depth gauge capabilities when skin diving
or snorkeling.
Warning!
• The measurement functions built into this watch are not intended for taking
measurements that require professional or industrial precision. Readings
produced by this watch should be considered as reasonable representations
only.
• This watch is intended for use up to skin diving and snorkeling. Never use this
watch while scuba diving.
• Be sure to obtain adequate safety instruction and training before engaging in
skin diving or snorkeling.
• CASIO COMPUTER CO., LTD. assumes no responsibility for any loss, or any
claims by third parties that may arise through the use of this watch.
About This Manual
General Guide
• The hour hand, minute hand, and 24-hour (middle) dial indicate the current time in
all modes. The information indicated by the depth/chronograph hand and the other
two dials depends on the current mode. For details, see the sections of this manual
that cover each of the modes.
Depth/chronograph hand
Hour hand
• The pressure sensor is located on the back of the watch.
• Use B to cycle between modes as shown below.
Diving Mode
▲
• When you change to another mode, the depth/chronograph hand rotates at high
speed a number of times and finally stops at the 12 o’clock position. Make sure you
wait until the depth/chronograph hand stops before you perform any other operation
in the mode you select.
Timekeeping
Depth/chronograph hand
Hour
24-hour dial
Locked
• Never unlock the crown while the watch, especially the area around the crown, is
wet. Doing so creates the risk of water getting inside the watch, which can lead to
malfunction.
• Never press A or B while the crown is unlocked. Doing so can cause the watch to
enter another mode and result in misalignment of hands.
• Make sure you lock the crown after you finish setting the current time and date.
• Make sure that the hand of the middle (24-hour) dial is pointing to the correct hour of
the day when setting the time. An incorrect middle dial setting can cause the date to
change at noon instead of midnight.
• The date indicator is based on a 31-day month. Because of this, you will need to
change the date setting at the end of February, April, June, September, and
November to adjust for the shorter month.
• Avoid changing the date setting while the current time is between 9:00 p.m. and
1:00 a.m. If you change the date setting during this period, the date setting may not
change properly to the next day at midnight.
Minutes
Seconds
Crown
• Button operations are indicated using the letters shown
in the illustration.
• Each section of this manual provides you with the
information you need to perform operations in each
mode. Further details and technical information can be
found in the “Reference” section.
Crown
Top dial
Middle dial
Date
Crown
Minute hand
Hold down B
for about two
seconds.
▲
▲
Use the Timekeeping Mode to set the current time and
date.
• All of the operations in this section are performed in the
Date
Timekeeping Mode.
• In the Timekeeping Mode, the current time seconds
count is indicated by the bottom dial. The depth/
chronograph hand remains stopped at the 12 o’clock
position.
Read this before setting current time and date!
• Make sure that the top dial hand is pointing at TM
Crown
(Timekeeping Mode) before setting the time and date.
• This watch has a screw lock crown. Do not pull on the
crown with undue force while it is locked.
Unlocked
Bottom dial
Timekeeping Mode
Top dial hand
Press B.
▲
Hold down B for
about two seconds.
Chronograph Mode
▲
To set the time
Unlock
First click
To set the date
Unlock
First click
(Sets the date.)
Second click
(Sets the time.)
1. Rotate the crown towards you to unlock it.
2. Pull out the crown to the second click.
• At this time, the hand of the bottom dial will move to
the 12 o’clock position and stop there.
3. Rotate the crown to set the correct time.
• Note that the hand of the middle (24-hour) dial moves
in coordination with the hour and minute hands. When
adjusting the time, keep an eye on this dial to make
sure that its hand indicates the correct hour of the
day.
4. When the setting is the way you want, re-lock the crown
by pressing it in as you rotate it away from you.
1. Rotate the crown towards you to unlock it.
2. Pull the crown out to the first click.
3. Rotate the crown towards you to set the date.
4. When the setting is the way you want, re-lock the crown
by pressing it in as you rotate it away from you.
Diving
Depth
Depth dial
(Unit: 1 meter)
Seconds
• Relatively accurate depth measurement is guaranteed within the temperature range
of 10°C to 40°C. Do not use this watch in temperatures outside this temperature
range.
• If you do not submerge past one meter for about 30 minutes while the depth/
chronograph hand indicates zero (12 o’clock) in the Diving Mode, the watch will
automatically switch to the Timekeeping Mode.
Be sure to read “Diving Mode Precautions” before actually using the watch while
skin diving or snorkeling.
What is “a dive” ?
A dive starts when you pass a depth of one meter while the watch is in the Diving
Mode. The dive ends when you are on the surface and exit the Diving Mode. A dive
does not end if you surface but do not exit the Diving Mode.
Enter the Diving Mode.
Depth = 1.0 m
Start of dive
Maximum depth
• Remember that the term “dive” as used in this manual refers to skin diving or
snorkeling only.
• When you enter the water while the watch is in the Diving Mode, the watch will start
depth measurement automatically when the sensor detects that your depth exceeds
one meter. Depth measurement stops automatically whenever your depth becomes
less than one meter.
• When there is large difference between air temperature and water temperature,
immerse the watch in the water for two or three minutes before starting a Diving
Mode measurement.
• After you enter the Diving Mode, the watch automatically takes a reference pressure
reading and sets the result as 0 meters. This means that before starting a dive, you
should enter the Diving Mode while at the water’s surface, never while the watch is
submerged.
The pressure sensor of the watch can be used to perform
underwater depth measurement while skin diving or
snorkeling.
The watch maintains a single maximum depth reading,
which is the maximum depth measured during your last
dive.
• Depth measurement starts automatically whenever you
enter the water while the watch is in the Diving Mode.
• In the Diving Mode, the depth/chronograph hand points
to the value of the depth dial around the periphery of the
face that corresponds to the current depth reading.
Important!
• Never use this watch to measure depth while scuba
diving.
• Never perform any button operations or rotate the
crown while underwater.
Exit the Diving Mode.
End of dive
1
Operation Guide 3377
To perform depth measurement
4. When you want to end the dive, return to the surface and then hold down B for
about two seconds to exit the Diving Mode and enter the Timekeeping Mode.
• Note that you cannot exit the Diving Mode while your current depth is one meter or
greater.
• The maximum depth that can be indicated is 50 meters. At deeper depths the depth/
chronograph hand will point to OVER ZONE.
• Even if the watch is performing a Diving Mode operation, low battery power will
cause the watch to stop measurement and automatically enter the Timekeeping
Mode. If this happens, the maximum depth reading of your current dive will not be
recorded in memory.
Maximum Depth Reading
When you exit the Diving Mode after a dive, the watch will store the maximum depth
reading you achieved during the dive. The maximum depth reading will remain in
memory until you start a new dive, which causes the existing value to be replaced with
the maximum depth reading of the new dive.
• Depths less than one meter are not used for the maximum depth reading.
To view the maximum depth reading
In the Timekeeping Mode or Diving Mode (while the depth/chronograph hand is at the
12 o’clock position), press A. This will cause the depth/chronograph hand to move
until it points to the value that corresponds to the currently stored maximum depth
reading.
• The depth/chronograph hand will return to the 12 o’clock position automatically after
about 30 seconds, or if you press A again.
• If the maximum depth reading is 50 meters or greater, the depth/chronograph hand
will point to OVER ZONE.
• The maximum depth reading currently stored in memory is cleared whenever the
watch’s battery goes dead. Be sure to keep a separate record of your maximum
depth reading, if necessary.
• If you perform the above operation before diving with the watch for the first time after
purchasing it, the maximum depth reading may show the result of depth
measurement testing performed at the factory.
Diving Mode Precautions
Note the following important precautions whenever using the Diving Mode.
Before Skin Diving or Snorkeling
• Avoid taking a quick series of deep breaths before you submerge. Doing so
creates the risk of loss of consciousness.
• Make sure that the crown is fully locked.
• Make sure that the depth/chronograph hand is pointing at the 12 o’clock
position (0 meters) in the Diving Mode. If it isn’t, adjust the hand position.
• Make sure the hand of the bottom dial is moving normally (one-second
increments). If it is jumping in two-second increments, it means the battery is
low and the watch will not stay in the Diving Mode. You will need to have the
battery replaced before you can use the Diving Mode.
• Make sure that the watch is set to the correct time of day.
• Make sure the glass, case and band are not cracked or chipped. Never use a
damaged watch while diving.
••
• Make sure that the band is fastened securely around your wrist.
••
While Skin Diving or Snorkeling
• Avoid sudden surfacing and submersion. Sudden surfacing creates the risk of
developing “the bends” (decompression sickness). Also, this watch may not
indicate the correct depth if you submerge at a rate in excess of one meter per
second.
• Check to make sure that depth measurements are being performed properly.
Always use another depth gauge to make sure that the depth measurements
produced by this watch are correct.
• Take care when diving near rocks or coral to avoid scratching or damaging the
watch.
After Skin Diving or Snorkeling
• Be sure to rest sufficiently between dives. Also, note that riding an aircraft or
otherwise moving to high altitudes immediately following a dive can cause
decompression sickness.
• To avoid corrosion, rinse your watch thoroughly with fresh water to remove
salt water, dirt, etc. When possible, soak the watch in fresh water overnight to
make sure that all salt is removed.
• When using a metal band, occasionally clean inside the gaps in the band
using a soft toothbrush and soapy water. Failure to do so can result in
corrosion of the timepiece, soiling of clothing, or irritation to sensitive skin.
1. Before beginning a dive, hold down B for about two
seconds to enter the Diving Mode.
2. Check to make sure that the hand of the top dial is
pointing at DIV, and that the depth/chronograph hand is
pointed at 12 o’clock (0 meters).
3. Enter the water and submerge past one meter to start
the dive.
• The depth/chronograph hand will remain pointed at 12
o’clock (0 meters) as long as you remain at a depth of
less than one meter.
• The watch takes a depth reading at 1-second
intervals.
Chronograph
The chronograph lets you measure elapsed time.
Minutes
1/20 second
Seconds
• All of the operations in this section are performed in the
Chronograph Mode, which you enter by pressing B.
• Entering the Chronograph Mode causes the bottom dial
hand to move to the 12 o’clock position.
• In the Chronograph Mode, the depth/chronograph hand
shows the seconds of the elapsed time measurement,
the top dial hand shows elapsed minutes, and the
bottom dial hand shows elapsed 1/20 second.
• If you don’t perform any operation for about three
minutes in the Chronograph Mode while it is cleared to
all zeros (depth/chronograph hand, top dial hand, and
bottom dial hand all in the 12 o’clock positions), the
watch will automatically return to the Timekeeping
Mode.
To measure elapsed time
1. Press A to start the chronograph.
2. Press A again to stop the chronograph.
• You can resume the measurement operation by pressing A.
3. While the chronograph is stopped, hold down A for about two seconds to clear the
chronograph to all zeros.
• The display range of the chronograph is 59 minutes, 59.95 seconds. Chronograph
operation stops automatically when the current elapsed time operation reaches 60
minutes.
• The hand of the bottom dial revolves for the first 30 seconds of each elapsed time
operation. After that, it stops automatically at the 12 o’clock position. When you stop
an elapsed time measurement, the hand of the bottom dial will move automatically
from the 12 o’clock position to the current 1/20 second count.
• You cannot change to another mode while an elapsed time operation is in progress.
If you need to change to another mode, stop the elapsed time operation and clear
the chronograph to all zeros first.
• Pressing B while the chronograph is stopped but not cleared to all zeros will
change to the Timekeeping Mode, but it will also cause the chronograph to be
cleared to all zeros automatically.
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Questions & Answer s
Question: Why does the hand of the bottom dial (seconds count of the current
time) seem to be too slow?
Answer: The watch’s battery is low. Have it replaced as soon as possible. See “Low
Battery Indication” for more information.
Question: What should I do if the depth/chronograph hand does not point
exactly at 12 o’clock (0 meters) when I enter the Diving Mode?
Answer: Use the procedure under “Adjusting Hand Positions” to adjust
the depth/chronograph hand position.
Question: Why does the depth/chronograph hand point to OVER ZONE when I
enter the Diving Mode?
Answer: This can indicate some problem with the pressure sensor. Depth
measurements are not possible in this case. Try switching to the
Timekeeping Mode and then back to the Diving Mode. If this does not correct
the problem, contact your dealer or CASIO distributor.
Question: What should I do if the depth/chronograph hand does not point to 12
o’clock (0 meters) and I cannot exit the Diving Mode when I am at a depth of
less than one meter?
Answer: Use the procedure under “Resetting the Diving Mode” to exit the Diving
Mode, and then use the procedure under “To adjust hand
positions” to adjust hand positions.
Question: How does the watch calculate depth values?
Answer: Water pressure increases with depth. In the case of sea water (specific
gravity=1.025), water pressure increases by 1 ATM (1.03 kg/cm
10 meters of depth.
The pressure sensor of this watch measures water pressure, and then
converts it to an underwater depth reading, based on the relationship
between pressure and depth.
Question: Is there anything I need to keep in mind when diving at high altitudes
or in fresh water?
Answer: The depth reading is automatically reset to 0 m whenever the Diving Mode is
entered, so you can use this watch for diving at altitudes. Note, however, that
malfunctions occur when diving at altitudes greater than approximately 4,000
meters. Also, this watch bases its calculations on sea water, which has a
specific gravity of 1.025, so depth readings will not be correct during freshwater diving. During fresh-water dives, you must assume that you are
approximately 2.5% deeper than the depth shown on the display.
Example: When the depth reading is 5 meters, actual depth is
5
×
Question: What should I do if the depth/chronograph hand, top dial hand, and
bottom dial hand don’t align correctly with their starting positions (12
o’clock) when I enter the Chronograph Mode?
Answer: Use the procedure under “Adjusting Hand Positions” to adjust hand positions.
Low Battery Indication
Low battery power is indicated when the hand of the bottom dial (seconds count of the
current time) starts jumping in two-second increments instead of the normal onesecond increments. When this happens, request battery replacement from your dealer
or CASIO distributor.
• If low battery indication starts while the watch is in the Timekeeping Mode, you will
not be able to change to another mode.
• If low battery indication starts while the watch is in the Diving Mode or Chronograph
Mode, the watch will automatically switch to the Timekeeping Mode, even if a
measurement operation is in progress.
Using the Elapsed Time Bezel
Elapsed time bezel
(Unit: 1 minute)
1.025 = 5.1 meters.
Rotate the elapsed time bezel to align the mark with
the minute hand. After that, elapsed time is indicated by
the value on the bezel that the minute hand is pointing to.
• Rotate the elapsed time bezel in a counter-clockwise
direction only. Never try to force the bezel to rotate
clockwise. Doing so can damage it.
2
) with each
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