Rate Of Change In Altitude; Section 4:The Barometer; How To Set The Sea Level Pressure; Barometric History - Oregon Scientific AT108A User Manual

RATE OF CHANGE IN ALTITUDE

You can monitor the actual rate of change in altitude during your trip.
The maximum ascending speed as well as the descending speed will
be recorded automatically. You may recall and erase this memory
record (fig 11).
Note:
please refer to Section 7 for overall erase memory record.
SECTION 4 THE BAROMETER
This section applies to all models.
There are two display modes in BAROMETER:
• Sea pressure and clock
• Sea pressure and temperature
Refer to Fig 12 to change among the display mode.
HOW TO SET THE SEA LEVEL
PRESSURE
When you first use the OUTBREAKER, please calibrate the sea
level pressure. It will be altered due to the the barometric change and
not the change in altitude.
You can obtain the current sea level pressure from newspaper, local
news and radio weather reports or through the internet weather
station.
Refer to fig 12a to set the sea level pressure. Repeat this procedure
after changing the battery or after one year of operation.

BAROMETRIC HISTORY

Your unit retains the hourly barometric pressure for the past 24
hours. Refer to fig 12b to recall the reading for a certain hour.

WEATHER FORECAST

Apart from determining the altitude, the barometer also helps forecast
the weather for the forthcoming 12 to 24 hours basing on based
pressure changes. The effective range is 18 to 30 miles.
The forecast will automatically be displayed as one of these four
icons:
Indicator
displays
on the unit
Forecast Sunny Slightly cloudy
8
Cloudy Rainy