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Oregon Scientific AP 928 - WMR928NX Manual

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7
ALTITUDE
An air data calculator is included in Virtual Weather Station. Virtual Weather Station uses the same formulas
used in airplane data computers flying throughout the world. The altitude and air data information provides air
density, pressure altitude, corrected temperature and pressure to sea-level conditions.
TIME ZONE
The time zone is required for calculating the sunrise, sunset, moonrise and moonset. If you live in a time zone
that does not adhere to the GMT standard and is offset by 30 minutes, enter the offset in the +Time Zone Offset
(min) numerical field.
If the daylight savings time is not calculated properly by your Windows operating system, you can compensate by
adding or subtracting 60 minutes.
The celestial calculator is a close approximation of the sunrise and sunset in your location and may be inaccurate
by several minutes due to equation inaccuracy or your altitude (the equations are based on sea-level conditions).
CELESTIAL CALENDAR
Virtual Weather Station includes a celestial calendar for calculating sunrise, sunset, moonrise and moonset times.
You can calculate these times for any calendar date.
AIR DATA CALCULATOR (CORRECTING PRESSURE TO SEA-LEVEL CONDITIONS)
To compare pressure conditions from one location to another, meteorologists correct pressure to sea-level
conditions. Because the air pressure decreases as you rise in altitude, the sea-level corrected pressure (the
pressure your location would be at if located at sea-level) is generally higher than your measured pressure. Thus,
your pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but the corrected pressure is
30.00 inHg (1016 mb).
The standard sea-level pressure is 29.92 in Hg (1013 mb). Pressure conditions greater than 29.92 inHg (1013
mb) are considered high pressure.
Most weather stations instruct you to find a reporting station near your location to identify the corrected pressure,
but Virtual Weather Station calculates this offset for you. To calculate this offset:
1. Enter your altitude. Virtual Weather Station displays your bias with respect to sea level.
2. Enter this bias in your weather station (see the weather station user manual for details).
MULTIPLE STATION SETTINGS
Menu Shortcut: Settings X Multiple Station Settings
Virtual Weather Station supports multiple station
configurations. Thus, the data and desktop settings can be
different for each weather station in a network of weather
stations.
To create new station settings, select “Create New Station”.
To recall a station setting, select “Recall Existing Station”.
The data for each station is stored in a file based on the
station name, as displayed in the Station Directory
Pathname. To select this file, double-click on the filename.
REAL-TIME DATA
Virtual Weather Station continuously collects data from your weather station. The sample rate varies based on
your weather station's specifications. See your weather station user manual for specifics on the sample rate.
… 7 …


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