• With the 24-hour format, times are displayed in the range of 0:00 to 23:59,
without any indicator.
• The 12-hour/24-hour timekeeping format you select in the Timekeeping
Mode is applied in all modes.
• The year can be set in the range of 2000 to 2039. The day of the week is
calculated automatically in accordance with the date you set.
• The watch's built-in full automatic calendar automatically makes allowances
for different month lengths and leap years. Once you set the date, there
should be no reason to change it except when battery power drops to Level
A built-in bearing sensor detects magnetic north and indicates one of 16
directions on the display. Direction readings are performed in the Digital
• You can calibrate the bearing sensor if you suspect the direction reading is
To enter and exit the Digital Compass Mode
1. While in the Timekeeping or Barometer/Thermometer Mode, press B to
enter the Digital Compass Mode.
• At this time, the watch immediately starts a Digital Compass operation.
After about two seconds, letters appear on the display to indicate the
direction that the 12 o'clock position of the watch is pointing.
2. Press D to return to the Timekeeping Mode.
To take a direction reading
1. Enter the Digital Compass Mode.
Magnetic north pointer
2. Place the watch on a flat surface or, if you are
12 o'clock position
wearing the watch, make sure that your wrist
is horizontal (in relation to the horizon).
3. Point the 12 o'clock position of the watch in
the direction you want to measure.
4. Press B to start a Digital Compass
• After about two seconds, the direction that the
12 o'clock position of the watch is pointing
appears on the display.
Angle value (in degrees)
• Also, four pointers appear to indicate magnetic
north, south, east, and west.
• After the first reading is obtained, the watch
continues to take direction readings
automatically each second, for up to 20
• During measurement, the watch displays an angle value, a direction
indicator, and four direction pointers, which change dynamically when the
watch is moved. After measurement is complete, the angle value,
direction indicator, and four direction pointers are frozen in accordance
with the last measurement.
indicator flashes on the display while a measurement is in
• Note that taking a measurement
while the watch is not horizontal
(in relation to the horizon) can
result in large measurement error.
• The margin of error for the angle value is ±11 degrees. If the indicated
direction is northwest (NW) and 315 degrees, for example, the actual
direction can be anywhere from 304 to 326 degrees.
• Any ongoing direction measurement operation is temporarily paused while
the watch is performing an alert operation (daily alarm, Hourly Time Signal,
countdown timer alarm) or while the watch's backlight is turned on (by
pressing L). The measurement operation resumes for its remaining
duration after the operation that caused it to pause is finished.
• The following table shows the meanings of each of the direction
abbreviations that appear on the display.
Operation Guide 2825
• You can adjust the rotary direction bezel so
pointer. This aligns all of the direction angle
markings on the bezel with their correct
• See "Digital Compass Precautions" for other
important information about taking direction
This watch uses a pressure sensor to measure air pressure (barometric
pressure) and a temperature sensor to measure temperature.
• You can calibrate the temperature sensor and the pressure sensor if you
suspect that readings are incorrect.
To take barometric pressure and temperature readings
Pressing C in the the Timekeeping or Digital Compass Mode enters the
Barometer/Thermometer Mode and automatically starts taking barometric
pressure and temperature measurements.
History Graph and
• It can take up to four or five seconds for the barometric pressure reading to
appear after you enter the Barometer/Thermometer Mode.
• Barometric pressure is displayed in units of 1hPa (or 0.05 inHg).
• The displayed barometric pressure value changes to
a measured barometric pressure falls outside the range of 600 hPa to 1100
hPa (17.70 inHg to 32.45 inHg). The barometric pressure value will be
displayed again as soon as the measured barometric pressure is within the
• Temperature is displayed in units of 0.1°C (or 0.2°F).
• The displayed temperature value changes to
measured temperature falls outside the range of –10.0°C to 60.0°C (14.0°F
to 140.0°F). The temperature value will be displayed again as soon as the
measured temperature is within the allowable range.
• In some areas, barometric pressure is expressed in millibars (mb) instead
of hecto-pascals (hPa). It really makes no difference, because 1hPa = 1mb.
• You can select either hectopascals (hPa) or inchesHg (inHg) as the display
unit for the measured barometric pressure, and Celsius (°C) or Fahrenheit
(°F) as the display unit for the measured temperature value. See "To specify
barometric pressure and temperature units".
• See "Barometer and Thermometer Precautions" for important precautions.
Barometric Pressure History Graph
Barometric pressure indicates changes in the atmosphere. By monitoring
these changes you can predict the weather with reasonable accuracy.
The barometric pressure history graph contains points that show you the
changes in barometric pressure readings taken by the watch for up to the last
18 hours. The rightmost point on the graph is the latest reading. The relative
positions of the points on the graph indicate whether barometric pressure is
rising, falling, or holding relatively steady.
• Though you can configure the watch to display barometric pressure in units
of hPa or inHg, the history graph displays changes in hPa units only.
• If a measurement operation cannot be performed by the watch due to
sensor malfunction, low battery power, or some other reason, the value
produced by next successful barometric pressure measurement is
compared with the value of the last successful measurement and plotted on
the history graph accordingly.
• Note that barometric pressure measurement is not performed while the
watch is in the Depth Gauge Mode. The value produced by the next
successful barometric pressure measurement is compared with the value of
the last successful measurement and plotted on the history graph
The following shows how to interpret the data that appears on the barometric
pressure history graph.
A rising graph generally means improving weather.
A falling graph generally means deteriorating weather.
is aligned with the magnetic north
Press C to
hPa (or inHg) if
°C (or °F) if a
Large rise (5hPa or more)
Small rise (3hPa to 4hPa)
Relatively steady (within ± 2hPa)
Small drop (3hPa to 4hPa)
Large drop (5hPa or more)