Trend Arrow Indicators; Barometric / Atmospheric Pressure; Wind Speed And Wind Direction - National Geographic WIFI Weather Center 7in1 Instruction Manual

34 Trend arrow indicators

1
1 Rising
3 Falling
The temperature and humidity trend indicator shows the trends of changes in the forthcoming few
minutes. Arrows indicate a rising, steady or falling trend.

35 Barometric / Atmospheric Pressure

Atmospheric pressure (hereinafter referred to as "air pressure") is the pressure at any place on earth
caused by the weight of the layer of air above it. Air pressure is proportional to average pressure and
decreases gradually with altitude. Meteorologists use barometers to measure air pressure. Because
the weather is highly dependent on changes in air pressure, it is possible to make a weather forecast
from the measured changes in air pressure.
To display the barometric pressure in a different unit of measurement
In normal display mode, press the BARO button for about 2 seconds to change the unit in this order:
(hPa, inHg or mmHg).
Change the mode from (ABS) Absolute Air Pressure to (REL) Relative Air Pressure
In normal display mode, press the BARO button to toggle between absolute air pressure and relative
air pressure.
• NOTICE!
• NOTICE! ABS: Absolute air pressure at your current location
• NOTICE! REL: Relative air pressure based on sea level (N.N.)
• NOTICE! The default relative air pressure value is 1013 mbar/hPa (29.91 inHg), which is rel-
ative to the average air pressure value.
• NOTICE! If the value for the relative air pressure is changed, the weather displays also
change as a result.
• NOTICE! The built-in barometer registers changes in absolute air pressure caused by the en-
vironment. Based on the collected data, a forecast for the weather conditions in the next 12
hours can be made. The weather indicators change according to the determined absolute air
pressure after only one hour of operation.
• NOTICE! The relative air pressure is based on sea level, but it also changes with changes in
absolute air pressure after one hour of operation.

36 Wind speed and wind direction

2
2 Steady
3
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