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Checking Changes in
Barometric Pressure Over
Time
Your watch shows a graph of barometric
pressure readings taken at two-hour intervals.
You can view barometric pressure readings
for the past 42 hours. The square (
v
) at the
far right of the graph indicates the latest
barometric pressure reading.
Barometric
pressure
(1 hPa per
division)
Time (2 hours per division)
●
Predicting Upcoming Weather
A trend
like this:
Means this:
Rising barometric pressure,
which indicates that upcoming
weather probably will be fair.
Falling barometric pressure,
which indicates that upcoming
weather probably will be bad.
Note
●
Large changes in barometric pressure
and/or temperature can cause past
data readings to be plotted outside of
the visible area of the graph. Though
plots are not visible, the data is still
maintained in watch memory.
Checking the Change
Between Two Barometric
Pressure Readings
(Barometric Pressure
Differential)
In the Barometer/Temperature Mode, the
display shows the current measured value,
and a graphic indicator of the differential
between the automatically measured current
value and the latest value measured at two-
hour intervals.
Example: Barometric pressure differential of
-3 hPa (approximately -0.9 inHg)
10
5
0
−5
−10
Pressure
Differential
Indicator
Range: ±10 hPa
(1 hPa units)
Unit: hPa
Note
●
The barometric pressure differential
graphic indicator will not be displayed
if the barometric pressure differential
exceeds ±10 hPa, or if the barometric
pressure measurement value exceeds
the measurement range.
Sudden Barometric Pressure
Change Indications
Whenever the watch detects a significant
change in air pressure readings (due to
sudden ascent or descent, or to the passage
of a low-pressure or high-pressure area), it will
beep to let you know. An arrow will also flash
on the display at this time if the watch is in the
Barometer/Temperature Mode, or if it is in the
Timekeeping Mode with the barometric
pressure graph displayed. The arrow that
appears shows the direction of the pressure
change. These alerts are called “Barometric
Pressure Change Indications”.
This
indicator:
Means this:
Sudden drop in pressure
Sudden rise in pressure
Sustained rise in pressure,
shifting to a fall
Sustained fall in pressure, shifting
to a rise
Important!
●
To ensure correct barometric pressure
change indicator operation, enable it in
a location where the altitude is
constant (such as a lodge, camp area,
or on the ocean).
●
A change in altitude causes a change
in air pressure. Because of this, correct
readings are impossible. Do not take
readings while ascending or
descending a mountain, etc.
Watch Operation Guide 3553
26
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