Kestrel 4500 - Manual (Page 15)

Kestrel ® 4500 Pocket Weather ® Tracker 29
True North
True north is a navigational term referring to the direction of the North Pole relative to the navigator’s
position. The direction of true north is marked in the skies by the celestial north pole.
Wet Bulb Temperature
The lowest temperature to which a thermometer can be cooled by evaporating water into the air
at constant pressure. This measurement is a holdover from the use of an instrument called a sling
psychrometer. To measure wet bulb temperature with a sling psychrometer, a thermometer with a wet
cloth covering over the bulb is spun rapidly through the air. If the relative humidity is high, there will be
little evaporative cooling and the wet bulb temperature will be quite close to the ambient temperature.
Some exercise physiology guides use wet bulb temperature, rather than heat index, as a measure of the
safety of exercise in hot and humid conditions.
Wind Chill
The cooling effect of combining wind and temperature. The wind chill gives a more accurate reading
of how cold it really feels to the human body. The Kestrel Meter’s wind chill is based on the National
Weather Service standards as of November 1, 2001.
DEFAULT SETTINGS
UNIT METRIC IMPERIAL
Wind Functions M/s mph
Temperature Functions °C °F
Barometric Pressure hPa inHg
Altitude Functions M Ft
Time Format 24 hour 12 hour
Date Format Day/month/year Month/day/year
SETTING FACTORY DEFAULT
Automatic Data Store On
Data Store Rate 1 hour
Data Overwrite On
Manual Data Store On
User Screen 1 Direction, wind speed, temperature
User Screen 2 Temperature, Humidity, dewpoint
User Screen 3 Pressure, altitude, density altitude
Display Contrast 10
Automatic Shutdown 15 minutes
Language English
PC Upload
Stored data may be uploaded to a PC with the optional Kestrel Interface.
FREQUENTLY ASKED QUESTIONS
How do I set my Kestrel Meter to read the correct barometric pressure and altitude?
To measure these values accurately, you must know either your current pressure or altitude. If you
know the current barometric pressure, go to the altitude screen, and press the button to enter the
reference pressure. As you adjust the reference pressure, you will notice that the altitude will change.
Once the reference pressure is entered, note the new altitude, and go to the barometric pressure screen.
Press the button to enter this altitude as the reference altitude. Your Kestrel Meter is now displaying
the accurate pressure and altitude. (If you start with a known altitude, simply start with entering this