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WEATHER GLOSSARY
DIRECTION –
Compass heading in true or magnetic North.
WIND SPD –
Wind Speed is the measurement of the wind
passing through the impeller. For greatest accuracy, point the
back of the Kestrel directly into the wind.
CROSWND –
Crosswind uses the internal compass and a user
selected heading to calculate the crosswind component of
the full wind.
HEADWND –
Headwind uses the internal compass and a
user selected heading or target direction to calculate the
headwind component of the full wind.
TEMP –
Ambient Temperature is the temperature measured
at the thermistor. For best results, ensure the thermistor
is not exposed to direct sunlight and is exposed to good
airflow.
CHILL –
Wind Chill is a calculated value of the perceived
temperature based on temperature and wind speed.
HUMIDITY –
Relative Humidity is the amount of moisture
currently held by the air as a percentage of the total possible
moisture that the air could hold.
HEAT INDEX –
Heat Index is a calculated value of the
perceived temperature based on temperature and relative
humidity.
DEW POINT –
Dew Point is the temperature at
which water vapor will begin to condense out of
the air.
WET BULB –
Wet Bulb is the lowest temperature
that can be reached in the existing environment by
cooling through evaporation. Wet Bulb is always
equal to or lower than ambient temperature.
BARO –
Barometric Pressure is the local station
(or absolute) pressure adjusted to mean pressure.
An accurate reading depends on a correct altitude
input and unchanging altitude while measuring.
ALTITUDE –
Altitude is the vertical distance
associated with given atmospheric pressure.
An accurate reading depends on correct initial
barometric pressure input and stable barometric
pressure while measuring.
STATION –
Station Pressure (Absolute Pressure)
is the pressure exerted by the atmosphere at the
location.
DENS ALT –
Density Altitude is the altitude at
which the density of the theoretical standard
atmospheric conditions (ISA) would match the
actual local air density.
Active –
Setting a target to active makes it selectable
in the main target screen.(Not available in Sportsman
models)
TR –
Target Range is the distance from the muzzle of the
rifle to the target.
DoF –
Direction of fire is the direction from the position
of the shooter to the target.
Ideg –
Inclination is the angle above or below horizontal
from the position of the shooter to the target.
Icos –
Inclination Cosine is the cosine of the angle above
or below horizontal from the position of the shooter to
the target.
TS –
Target Speed is the speed of the target
perpendicular to the direction of fire.
TD –
Target Direction is the direction of travel of the
target perpendicular to the direction of fire.
WD –
Wind Direction is the direction the wind is coming
from in relation to the direction of fire.
WS1 –
Wind Speed 1 is a five second rolling average
wind speed.
WS2 –
Wind Speed 2 is a five second rolling maximum
wind speed.
MV –
Muzzle Velocity is the speed of the bullet as it leaves
the muzzle. MV can be measured with a chronograph or
calculated using the MV Cal function. An MV estimate is
often provided by cartridge manufacturers or in reloading
manuals.
DM –
A Drag Model is the known aerodynamic drag profile
of a standard projectile against which an actual bullet is
referenced. Ballistics coefficients based on G1 drag models
are more widely available, ballistic coefficients based on
G7 drag models are more representative of a typical hollow
tip, boat tail bullet. (Applied Ballistics Custom Drag Models
– Using one of the Applied Ballistics custom drag models
replaces the use of a standard projectile drag model and it’s
associated BC. When a custom drag model is used, the BC
value appears as a 1. Applied Ballistics custom drag models
can only be used in Elite units.)
BC –
A Ballistic Coefficient is a ratio that represents the ability
of the bullet to overcome air resistance and maintain velocity
while in flight in comparison to a standard projectile. Be sure
to match the G1/G7 drag model setting to the BC value you
are using. G1 BCs can not be used with G7 drag models and
vice-versa.
BW –
Bullet Weight is the weight of the bullet measured in
grains or grams.
BD –
Bullet Diameter is the diameter of the bullet measured
in inches or millimeters. (Note! Ensure bullet diameter is
correct. The given name of a bullet’s caliber does not always
match its actual diameter, for example 300WM is actually
.308”, not .300”)
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