Lowrance 100 Installation And Operation Instructions Manual page 75

simply highlight each item on the list at right, press the
right arrow key, enter the values, and finally press the
ENT key. You'll need the indicated altitude "I ALT", baro-
metric pressure (BARO) in inches of mercury, outside
air temperature (I TEMP), and calibrated airspeed
(CAS).
On the example shown at right, the indicated altitude
is 5000 feet, barometric pressure is 30.02", outside air
temperature is 59° Fahrenheit, and the calibrated air-
speed is 129 knots. This gives us a pressure altitude of
4908 feet, a density altitude of 5740 feet, and a true
airspeed of 140.4 knots. Obviously, you don't need air-
speed to calculate density altitude, this was done for
illustration purposes.
Wind Speed/Direction
To determine the wind speed and direction, first solve
for true airspeed on the previous screen. Then, select
"WIND SPD/DIR" on the E6B Computer menu. A screen
similar to the one at right appears. With true airspeed
solved, the only other thing necessary for the unit to
determine the wind is your heading. In this example,
the heading is 321° magnetic. This gives us a wind
speed of 10.7 knots on a bearing of 333° magnetic, for
a 10.4 knot headwind.
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