<s>
Traffic	B-General_Concept
information	I-General_Concept
service	I-General_Concept
–	I-General_Concept
broadcast	I-General_Concept
(	O
TIS	O
–	O
B	O
)	O
is	O
an	O
aviation	O
information	O
service	O
that	O
allows	O
pilots	O
to	O
see	O
aircraft	O
that	O
are	O
not	O
emitting	O
ADS-B	B-Application
data	O
but	O
have	O
a	O
basic	O
transponder	O
.	O
</s>
<s>
As	O
aircraft	O
are	O
discovered	O
by	O
primary	O
radar	O
and	O
respond	O
with	O
encoded	O
altitude	O
information	O
,	O
this	O
information	O
is	O
broadcast	O
over	O
ADS-B	B-Application
.	O
</s>
<s>
It	O
presents	O
to	O
the	O
pilot	O
a	O
combined	O
representation	O
of	O
aircraft	O
positions	O
derived	O
from	O
GPS	O
satellite	O
and	O
ground-based	O
radar	O
data	O
,	O
specifically	O
:	O
aircraft	O
's	O
replies	O
to	O
ATC	O
interrogations	O
(	O
i.e.	O
,	O
they	O
are	O
responses	O
to	O
queries	O
as	O
sent	O
to	O
the	O
aircraft	O
from	O
air	B-Application
traffic	I-Application
controller	I-Application
on	O
the	O
ground	O
)	O
.	O
</s>
<s>
TIS-B	B-General_Concept
is	O
broadcast	O
to	O
aircraft	O
using	O
both	O
the	O
1090	O
MHz	O
extended	B-Application
squitter	I-Application
(	O
1090	O
ES	O
)	O
and	O
the	O
universal	O
access	O
transceiver	O
(	O
UAT	O
)	O
band	O
of	O
Automatic	B-Application
Dependent	I-Application
Surveillance	I-Application
–	I-Application
Broadcast	I-Application
(	O
ADS-B	B-Application
)	O
.	O
</s>
<s>
Currently	O
the	O
service	O
mainly	O
benefits	O
general	O
aviation	O
(	O
GA	O
)	O
aircraft	O
equipped	O
with	O
ADS-B	B-Application
"	O
in	O
"	O
hardware	O
by	O
providing	O
a	O
traffic	O
information	O
relay	O
to	O
a	O
screen	O
in	O
the	O
cockpit	O
.	O
</s>
