National Geographic IN102TOP - Manual (Page 5)

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To View the Current Alarm Time Settings
1. Press [ALARM] button to view the current alarm time-settings.
Moon Phase
The moon phases are displayed on the screen and show eight phases from new moon to
waning crescent.
Weather Forecast
This unit is capable of detecting atmospheric pressure changes to predict the weather
for the forthcoming 12 hours. The effective range covers an area of 30 to 50 km. The
accuracy of a general pressure-based weather forecast is about 70 to 75 percent, and
therefore, cannot be held responsible for any inconveniences caused by an inaccurate
reading. The weather forecast is meant for the next 12 hours. It may not necessarily
reflect the current weather situation.
Atmospheric Pressure Bar Chart
The atmospheric pressure bar chart records the atmospheric changes for the past 12
hours. The atmospheric pressure bar chart can be displayed in mb/hPa or inHg. To switch
between the two units of measurement press, the [PRESSURE] button.
Atmospheric Pressure
The current atmospheric pressure is shown on the atmospheric pressure window.
If you want to know the pressure history for a particular hour during the past 12 hours,
press the [HISTORY] button. Each press on the button will go back by one hour. If you hold
down the [HISTORY] button the search will increase rapidly. Use the [PRESSURE] button to
switch between mb/hPa and inHg. The pressure measuring range is: 795 – 1050 mb/hPa
(23.5 – 31.0 inHg).
Initiation for Weather Forecast and Barometric Pressure
The barometer display on this unit will differ from local sources (TV, radio, Internet, etc.).
Barometric pressure quoted in these types of mediums is “barometric pressure adjusted
to sea level,” which is a theoretical atmospheric pressure that accounts for decreasing air
pressure with elevation. Air pressure decreases 1.0 inHg for every 1,000 feet in elevation.
Consequently, the air pressure at the top of a mountain is considerably less than at sea
level. To account for this difference, tune into your local weather station via television,
radio, or Internet to determine the barometric pressure for your area. To properly set the
unit press and hold the [PRESSURE] button until the mb/hPa or inHg flashes. Press the
[+/˚C/˚F] or the [-] button to select desired unit of measurement and then [PRESSURE]
button to confirm and enter into barometric pressure-setting mode. Press the [+/˚C/˚F]
or the [-] button to input the actual barometric-pressure determined from your local
weather station. Press the [PRESSURE] button key to confirm the barometric pressure and
enter the weather icon setting. Press the [+/˚C/˚F] or the [-] button to select icon that
most closely resembles the current weather. Press [PRESSURE] button again to confirm
and return to normal mode.