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2172-9
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.
Auto Return Features
• If you leave a setting screen (one with flashing digits or other settings) on
the display for two or three minutes without performing any operation, the
watch automatically saves anything you have input up to that point and
exits the setting screen.
• If you leave the watch in the Alarm, Recall or Dive Profile Mode for about
one hour without performing any operation, it automatically changes to the
Timekeeping Mode. The watch also reverts to the Timekeeping Mode if
you leave it with the Diving Mode Surface Screen on the display without
performing a button operation for about one hour after surfacing.
Data and Setting Scrolling
The B and D buttons are used in various modes and screens to scroll
through data on the display. In most cases, holding down these buttons
during a scroll operation scrolls through the data at high speed.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode
is also applied in all modes.
• With the 12-hour format, the P (PM) indicator appears to the left of the hour
digits for times in the range of noon to 11:59 p.m. and the A (AM) indicator
appears to the left of the hour digits for times in the range of midnight to
11:59 a.m.
• With the 24-hour format, times are displayed in the range of 0:00 to 23:59,
without any indicator.
How the Diving Function Works
About depth and water pressure
Water pressure increases with depth. In the case of seawater (specific gravity
= 1.025), water pressure increases by 1 ATM (1.03kg/cm
2
) with each 10
meters (33 feet) of depth.
This watch makes uses a pressure sensor to measure water pressure and
then converts the pressure measurements to depth readings.
Operation of the pressure sensor and
00
00
0.
00
00
0
ll
ll
l (
00
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0
FF
FF
F) reset
The watch automatically initializes the depth reading to 0.0 l (0 F) and
starts to take readings whenever you enter the Diving Mode. When you begin
a dive, the sensor automatically takes depth readings and starts the dive
timer, which measures the elapsed dive time. Normally, you should enter the
Diving Mode just before you start your dive.
Current depth reading (Diving Mode)
The current depth reading displays your dive depth in real time, with the
displayed reading being updated every three seconds. When using the
current depth reading to monitor your ascent, we recommend that you ascend
at a rate of approximately 10 meters (33 feet) per minute (0.5m/2 feet every
three seconds).
Maximum depth reading (Diving, Recall, and Dive Profile
Modes)
In the Diving Mode, the maximum depth reading shows the maximum depth
reached since the start of the dive. In the Recall and Dive Profile Modes it
shows the maximum depth of each log data record.
Average depth reading (Recall Mode)
This reading shows the average depth during each dive. It is calculated by
dividing the total of all the depth readings by the number of readings.
• Since readings at depths less than 1 meter (4 feet) are ignored, you will not
be able to use average depth log data to calculate average air
consumption if tank air is consumed while on the surface.
• If there are any depth reading errors during a dive, the average depth
reading also shows an error, which is indicated by
xx.xl (xx F).
Valid Dives and Invalid Dives
A single “dive” often consists of several short dives or “legs,” between which
the diver frequently returns to the surface for certain “intervals” between legs.
For a leg to be counted as part of the dive, it must be at least 1 meter (4 feet)
in depth, and last for a duration of more than about two or three consecutive
minutes. Such a leg is called a “valid dive,” while a leg that does not satisfy
these conditions is called an “invalid dive.”
Dive Type Definition Description
• Starts measurement of
the surface interval.
• Records log data for the
dive.
• No surface interval
measurement
• No log data recorded
Valid Dive
Invalid Dive
• Submerged to a depth of at least
1 meter (4 feet) for a duration of
at least two or three consecutive
minutes
• Submerged depth less than 1
meter (4 feet) and/or for a
duration of less than two or three
consecutive minutes
• Note that Invalid Dives made during the surface interval do not affect the
surface interval.
• You can use this watch while skin diving without affecting dive data or
surface interval timing.
• Performing a Valid Dive while Log Memory is full causes the oldest Log
Memory record to be deleted.
Dive Time Calculation
Dive start
When the watch is in the Diving Mode, the diving timer starts automatically
whenever a depth of 1 meter (4 feet) is reached.
Dive end
When the watch is in the Diving Mode, the diving timer stops automatically
when you surface to a depth of less than 1 meter (4 feet).
Dive time
The dive time the total time elapsed at depths of 1 meter (4 feet) or more.
A10:00 A10:20 A10:30 A10:45
Enter Diving Mode Enter Timekeeping Mode
Current Time
Surface
Depth = 1.0m
(4ft)
Depth
Dive
start
time
20 minutes
Dive time = 35 minutes
15 minutes
Valid
Dive
Dive end
time
Time
Submerged
On the Surface
Surface Interval
The timer begins counting the surface interval immediately after you ascend
to a depth less than 1 meter (4 feet). The surface interval is not counted
following an Invalid Dive, and Invalid Dives made during a surface interval do
not affect the surface interval.
Note
• If you switch to the Timekeeping Mode after surfacing, be sure to switch
back to the Diving Mode before starting your next dive. If you stay in the
Diving Mode after surfacing, your next dive will be considered a
continuation of the previous dive, with data being added on accordingly.
• Note that the dive time does not necessarily equal the difference between
the dive start time and the dive end time. This is because dive timer stops
when you surface to a depth above 1 meter (4 feet) (for rests, etc.) The
dive time shows only the time spent submerged at depths greater than 1
meter (4 feet).
00
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0
ll
ll
l (
00
00
0
FF
FF
F) Reset
Automatic
00
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0.
00
00
0
ll
ll
l (
00
00
0
FF
FF
F) reset
The watch automatically resets the current depth reading to 0.0 l (0 F)
whenever you enter the Diving Mode, even if you are submerged at a
different pressure. Because of this, you should avoid entering the Diving
Mode while submerged.
Manual
00
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0.
00
00
0
ll
ll
l (
00
00
0
FF
FF
F) reset
Holding down A for at least two seconds in
the Diving Mode resets the current depth to
0.0 l (0 F). You should manually reset the
current depth whenever the depth reading
shows a value greater than 1 meter (4 feet)
even while you are on the surface. This can
happen when the sensor is subjected to
sudden and extreme temperature changes.
Zero Depth Pressure
• Normally, the watch sets the current pressure reading being produced by
its sensor as zero depth pressure whenever you enter the Dive Mode or
perform a manual reset (as long as the current pressure reading is less
than 1.24kg/cm
2
). Any increase in pressure above zero depth pressure is
interpreted as an increase in depth, relative to the zero depth pressure.
2
000
10 58
4
20
00
• If the current pressure reading being produced by the sensor is greater
than 1.24kg/cm
2
when an automatic or manual 0.0 l (0 F) reset operation
is performed, the watch disregards the sensor reading and sets a default
value of 1.033kg/cm
2
as zero depth pressure.
• A warning indicator (
) is shown on the display to let you know when the
default zero depth pressure is being used to produce depth readings. This
is because depth readings produced using the default zero depth pressure
are not as accurate as depth readings based on actual current pressure as
measured by the sensor.
• Use of the default zero depth pressure occurs in cases when you enter
the Dive Mode (which performs an automatic reset) or perform a manual
0.0 l (0 F ) reset operation while submerged.