Becker BD406 - Course Deviation Indicator (CDI) - Beacon;Navpoint Course View; Figure 44: Mission Mode - CDI, Angular Mode, Definition for Constant Course (CRS) in Beacon;Navpoint Course View; Figure 45: Mission Mode - CDI, Distance Mode, Definition for Constant Course (CRS) in Beacon;Navpoint Course View

Becker Avionics
DV16401.03 Issue 04 May 2021 BD406/PBD406 95
Course Deviation Indicator (CDI) – Beacon/NavPoint Course View
-30
TO
O
-90
TO
O
0
TO
O
45
TO
O
CDI value
CRS – Constant Course
Current BD406 Position (updated
continuously from GPS)
Target (Beacon or NavPoint)
CRS
Figure 44: Mission Mode - CDI, Angular Mode, Definition for Constant Course (CRS) in Beacon/NavPoint Course
View
CRS – Current Course
CDI =
0 km TO
CDI
= 14
km TO
CDI distance
CRS
Target
(Beacon or NavPoint)
Current BD
406 Position (updated continuously from GPS
)
Figure 45: Mission Mode - CDI, Distance Mode, Definition for Constant Course (CRS) in Beacon/NavPoint Course
View
Course Deviation Indicator (CDI) in Beacon/NavPoint constant course view shows angular difference
between:
• Constant Course (CRS) - set course with rotary knob (in range 0…359 degrees).
• True bearing
In angular mode CDI belongs to range [-90, 90] deg. details see "Figure 44: Mission Mode - CDI,
Angular Mode, Definition for Constant Course (CRS) in Beacon/NavPoint Course View" page 95.
CDI shows valid values only if target and GPS source supply valid data.
CDI value can be calculated in kilometer or nautical miles details see "Figure 45: Mission Mode - CDI,
Distance Mode, Definition for Constant Course (CRS) in Beacon/NavPoint Course View" page 95.
With a long push on rotary knob constant course becomes equal to true bearing.