Abbreviations
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EqBL
Equal bearing lines
EDDL
Equal differences in distance lines
EGNOS
European geostationary navigation overlay service
EM
Electric motor
EMF
Electromotive force
EMW
Electromagnetic waves
ERA
Effective reflective area
ERBL
Electronic range and bearing lines
ESDL
Equal sum in distance lines
ESL
Equal space line
ETA
Estimated time of arrival
EWS
Electromagnetic wave scattering
Ex.S
External systems
FA
Final approach
FAGC
Fast automatic gain control
FAS
Final approach segment
FC
Feeder circuit/path
FDD
Frequency difference detector
FEC
Forward error correction
FM
Frequency modulation
FMB
Frequency multiplier block
FMp
Frequency multiplier
FPAP
Flight-path alignment point
FrD
Frequency divider
GAGAS
Geostationary navigation supplement of the GPS
GB
Gearbox
GBAS
Ground-based augmentation system
GC
Gyrocompass
GCS
Ground control segment
GCU
Gain control unit
GDOP
Geometrical dilution of precision
GEO
Geostationary orbit
GES
Ground earth stations
GIC
GPS integrity channel
GLONASS Global navigation satellite system
GMS
Ground mission segment
GNSS
Global navigation satellite system
GPA
Glide-path angle
GPB
Glide-path beacon
GPIP
Glide-path intersection point
GPS
Global Positioning System
GR RNS
Goniometric-ranging (rho-theta) RNS
GRNS
Goniometric radio-navigational systems
GSS
Ground sensor stations
GST
Galileo system time