Glossary – Garmin GTS 855 User Manual
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190-00587-02 Rev. A
Garmin GTS 8XX Series Traffic Advisory System
gLossARY
AGL:
Above Ground level
Active Target:
Any intruder tracked by the appliance using active
interrogations
ADS-B:
Automatic Dependent Surveillance – Broadcast
ATCRBS:
Air Traffic Control Radio Beacon Service- A secondary
surveillance radar system having ground-based interrogators
and airborne transponders capable of operation on Modes
A and C
CLEAR CAS:
Correlated Location Enhanced ADS-B Receiver Collision
Avoidance System
CPA:
Closest Point Approach
GPS:
Global Positioning System
LRU:
Line Replaceable Unit
MHz:
Mega Hertz
Mode A:
A type of ATCRBS transmission which requests (via Mode
A interrogations) or reports (via Mode A replies) aircraft
identity information
Mode C:
A type of ATCRBS transmission which requests (via Mode
C interrogations) or reports (via Mode C replies) aircraft
altitude information
Mode S:
A type of secondary surveillance radar transmission which
contains a unique 24-bit discrete address, thus allowing
interrogations to be addressed to individual aircraft. Mode
S transmissions can be short (56 bits) or long (112 bits),
with long transmissions containing a 56-bit “message”
field.
NTA:
Number of TCAS equipped targets
NM:
Nautical Mile
PA:
Proximate Advisory
Target:
Any intruder tracked by the appliance
TA:
Traffic Advisory
TAS:
Traffic Advisory System
TCAS:
Traffic Alert and Collision Avoidance System