To-From; Compass Heading; Wind Correction; Rhumb Line - ASA Electronics cx-3 User Manual

◗ TO-FROM

The To-From function converts a course from (From)
a location into the course to (To) the same location
along the same radial, providing the reciprocal of any
number .
Problem: What is the course TO the VORTAC if
you are on the 150° radial?
Solution: Press the
FLT
submenu . Press:
1 5 0 and tap enter to input 150° From .
The display will show 330° as the course TO the
station .

◗ COMPASS HEADING

This function is used to account for the inherent
inaccuracies of the compass, caused by the
difference between the direction indicated by the
magnetic compass and the true North Pole (magnetic
variation), as well as magnetic disturbances within
the aircraft (deviation) . The inputs to this function are
THdg, magnetic variation (Var), and deviation (Dev) .
The output is the compass heading (CHdg) and
magnetic heading (MHdg) .
Problem: What is the compass heading for
a flight on a true heading of 203°, where the
compass deviation card indicates a 4° compass
deviation and the sectional chart indicates the
flight will have a 4° westerly variation?
Solution: Press the
FLT
Heading submenu . Press:
and tap enter to input the 203° THdg,
2 0 3
then
and tap enter to input the 4° Var (east is
4
least, west is best: enter a positive number for a
westerly variation and a negative number for an
easterly variation), then
and tap enter to input 4° Dev .
4
The display will show 211 .0° for the CHdg and
207° for MHdg .

◗ WIND CORRECTION

The Wind Correction function allows you to compute
the wind direction and speed during a flight . The
inputs to this function are GS, TAS, TCrs, THdg and
the outputs are WSpd, WDir and WCA .
Problem: Find the wind direction, wind speed
and wind correction angle given 350° THdg, 478
kts GS, 355° TCrs, and 500 kts TAS .
Solution: Press the
FLT
Correction submenu . Press:
and tap enter to input 478 KTS GS,
4 7 8
then
key . Select the To-From
key . Select the Compass
key . Select the Wind
– 12 –
and tap enter to input 500 KTS TAS,
5 0 0
then
and tap enter to input 355° TCrs,
3 5 5
then
and tap enter to input 350° THdg .
3 5 0
The display will show 47 .99 KTS WSpd, 290°
WDir and -5° WCA .

◗ RHUMB LINE

The Rhumb Line function allows you to compute
the true course (TCrs) and distance (Dist) between
multiple points (Lat, Long) .
Problem: What is the true course and
distance between JFK (40 .6°, 73 .7°) and LAX
(33 .9°, 118 .4°)?
Solution: Press the
FLT
Rhumb Line submenu . Scroll to POINT: A Lat
and press , to set the units to degrees (°) .
CONV
UNIT
Next, press:
4 0 . 6
and tap enter to input 40 .6°
Lat, then
and tap enter to input 73 .7°
7 3 . 7
Long for Point A . Then Scroll down to Point B
and press:
and tap enter to input 33 .9°
3 3 . 9
Lat, then
1 1 8 . 4
and tap enter to input
118 .4° Long .
The display will show 259° TCrs and 2,169 .82
NM Dist .

◗ HOLDING PATTERN

Holding may be necessary when ATC is unable to
clear a flight to its destination . The CX-3 will make
easy work of determining what type of entry is
necessary (Entry), as well as the inbound heading
(Inbound) .
Problem: What is the recommended procedure
to enter the holding pattern when an airplane is
heading 155° and is instructed to hold on the
270° radial, performing standard right turns?
Solution: Press , slide to the Holding Pattern
FLT
function and tap enter . Make sure the turn
direction is on Right (tap enter to toggle between
Right and Left) and scroll down to Head . Press:
and tap enter to input the airplane's
1 5 5
heading of 155°, then
and tap enter to input 270° for the
2 7 0
holding radial .
The display will show Direct Entry and 90° as the
Inbound heading .
key . Select the