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E-32
Digital Compass Precautions
Magnetic North and True North
The northerly direction can be expressed either as magnetic north or true
north, which are different from each other. Also, it is important to keep in mind
that magnetic north moves over time.
Magnetic north is the north that is indicated by the needle of a compass.
True north, which is the location of the North Pole of the Earth’s axis, is the
north that is normally indicated on maps.
The difference between magnetic north and true north is called the
“declination”. The closer you get to the North Pole, the greater the
declination angle.
Location
Taking a direction reading when you are near a source of strong magnetism can cause large errors in
readings. Because of this, you should avoid taking direction readings while in the vicinity of the
following types of objects: permanent magnets (magnetic necklaces, etc.), concentrations of metal
(metal doors, lockers, etc.), high tension wires, aerial wires, household appliances (TVs, personal
computers, washing machines, freezers, etc.)
Accurate readings are also impossible indoors, especially inside ferroconcrete structures. This is
because the metal framework of such structures picks up magnetism from appliances, etc.
Accurate direction readings are impossible while in a train, boat, air plane, etc.
True north
Earth
Magnetic north
True north
Earth
Magnetic north
E-33
Storage
The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of
this, you should store the watch away from magnets or any other sources of strong magnetism,
including: permanent magnets (magnetic necklaces, etc.), concentrations of metal (metal doors,
lockers, etc.), and household appliances (TVs, personal computers, washing machines, freezers, etc.)
Whenever you suspect that the watch may have become magnetized, perform the procedure under “To
perform bidirectional calibration” (page E-26).
E-34
Taking Temperature Readings
This watch uses a temperature sensor to measure temperature.
To take temperature readings
While in the Timekeeping Mode, press
E
.
TEMP
will appear on the display and temperature measurement will
start. After about one second, the measurement reading will appear on
the display.
The watch will continue to take temperature readings every fi ve
seconds for about two minutes.
The watch will return to the Timekeeping Mode after the reading
operation is complete (about two minutes).
Pressing
E
while a temperature reading operation is in progress will
restart a two-minute temperature reading operation.
Pressing
D
while a reading operation is in progress will stop the
operation and enter the Timekeeping Mode.
Temperature
Temperature is displayed in units of 0.1°C (or 0.2°F).
The displayed temperature value changes to
- - .-
°C (or °F) if a 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 reappear as soon as the
measured temperature is within the allowable range.
TemperatureTemperature
E-35
Display Units
You can select either Celsius (°C) or Fahrenheit (°F) for the displayed temperature value. See “To specify
the temperature unit” (page E-37).
Temperature Sensor Calibration
The temperature sensor built into the watch is calibrated at the factory and normally requires no further
adjustment. If you notice serious errors in the temperature readings produced by the watch, you can
calibrate the sensor to correct the errors.
Important!
Incorrectly calibrating the temperature sensor can result in incorrect readings.
Carefully read the following before doing anything.
Compare the readings produced by the watch with those of another reliable and accurate thermometer.
– If adjustment is required, remove the watch from your wrist and wait for 20 or 30 minutes to give the
temperature of the watch time to stabilize.
E-36
To calibrate the temperature sensor
1. Take a reading with another measurement device to determine the exact current temperature.
2. With the watch in the Timekeeping Mode, press
E
to enter the Thermometer Mode.
3. Hold down
A
for about two seconds until the temperature reading disappears from the display.
Release
A
at this time, which will cause the temperature reading to fl ash, which indicates the setting
mode.
4. Use
E
(+) and
B
(−) to calibrate the temperature value with the
reading of another instrument.
Each press of a button changes the temperature value in units of
0.1°C (0.2°F).
To return the temperature to its uncalibrated value (OFF setting),
press
E
and
B
at the same time.
Holding down
E
or
B
scrolls the setting at high speed.
5. Press
A
to complete calibration and restart the temperature reading
operation.
Thermometer Precautions
Temperature measurements are affected by your body temperature (while you are wearing the watch),
direct sunlight, and moisture. To achieve a more accurate temperature measurement, remove the watch
from your wrist, place it in a well ventilated location out of direct sunlight, and wipe all moisture from the
case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual surrounding
temperature.
E-37
Specifying Temperature Unit
Use the procedure below to specify the temperature unit to be used in the Thermometer Mode.
Important!
When
TOKYO
is selected as the Home City, the temperature unit is set automatically to Celsius (
°C
). This
setting cannot be changed.
To specify the temperature unit
1. In the Timekeeping Mode, press
E
to enter the Thermometer Mode.
2. Hold down
A
for about two seconds until the temperature reading starts to fl ash.
3. Press
D
to display the current temperature unit.
4. Press
E
to toggle the temperature unit between
°C
(Celsius) and
°F
(Fahrenheit).
5. After the setting is the way you want, press
A
to exit the setting
screen.
E-38
Checking the Tide Level, Moon Phase, and Moon Age (Tide/Moon)
You can use the watch to check the current tide level, Moon phase, and Moon age.
The above information is displayed for the currently selected Home Time City. You can also check
information for another city by changing to a different Home City (page E-15).
Note that the tide and Moon information displayed by this watch is approximate and is intended as
general information only. Never try to use it for marine navigation or any other purposes requiring
accurate measurements.
Viewing the Current Tide Level, Moon Phase, and Moon Age
To view the current tide level
Dial Hand 2 (at 6 o’clock) shows the current tide level in all modes except for the Digital Compass Mode
and Tide/Moon Data Mode.
Tide level (Tide Graph Hand)Tide level (Tide Graph Hand)
E-39
Low tideHigh tide
The tide level in the Home City is indicated even while the watch is in the World Time Mode.
If the Tide Graph hand indication is not correct, check the Timekeeping Mode time and date, and the
Home City settings. If this does not correct the problem, refer to “Calibrating the High Tide Time” (page
E-46).
To view the current moon phase
Moon Graph shows the current Moon phase in all modes except for the Tide/Moon Data Mode and the
setting mode (when a setting is fl ashing on the display).
Regardless of the watch module (page E-2), the white part of the Moon
Graph shows the currently visible (lit) part of the Moon.
Moon phase
(white part)
Module 5442 Module 5443
Moon phase (Moon Graph):Moon phase (Moon Graph):
Operation Guide 5442 5443
5

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