Checking Changes in
Barometric Pressure Over
Time
The watch displays a graph of 20 hours of
barometric pressure readings taken every two
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.
●
The barometric pressure graph is not
displayed while Barometric Pressure
Change Indications are displayed.
l
Sudden Barometric Pressure
Change Indications
Checking the Change in
Barometric Pressure
between Two Readings
When you perform the procedure below in the
Barometer Mode, the second hand indicates
the difference between the current barometric
pressure measurement and the last auto
measurement value (taken at two-hour
intervals).
1.
Enter the Barometer Mode.
l
2.
Press (D).
The second hand indicates the
barometric pressure differential (Pressure
Differential Indicator).
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
●
You can toggle between the two
second hand functions by pressing
(D).
l
Checking the Current Barometric
Pressure
●
The second hand points to [OVER] if
the current barometric pressure
differential is greater than +10 hPa (0.3
inHg), or [UNDER] if it is less than -10
hPa (-0.3 inHg).
●
A reading that is outside the allowable
measurement range of 260 hPa to
1,100 hPa (7.65 inHg to 32.45 inHg),
or any measurement error will cause
the second hand to move to 9 o’clock.
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 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 5678
25
