<s>
The	O
Navigation	B-Device
and	I-Device
Bombing	I-Device
System	I-Device
,	O
or	O
NBS	O
,	O
was	O
a	O
navigation	O
system	O
used	O
in	O
the	O
Royal	O
Air	O
Force	O
's	O
V-bomber	O
fleet	O
.	O
</s>
<s>
Primary	O
among	O
its	O
parts	O
was	O
the	O
Navigation	O
and	O
Bombing	O
Computer	O
(	O
NBC	O
)	O
,	O
a	O
complex	O
electro	O
mechanical	O
computer	O
that	O
combined	O
the	O
functions	O
of	O
dead	O
reckoning	O
navigation	O
calculation	O
with	O
a	O
bombsight	B-Application
calculator	O
to	O
provide	O
outputs	O
that	O
guided	O
the	O
aircraft	O
and	O
automatically	O
dropped	O
the	O
bombs	O
with	O
accuracy	O
on	O
the	O
order	O
of	O
a	O
few	O
hundred	O
metres	O
on	O
missions	O
over	O
thousands	O
of	O
kilometres	O
.	O
</s>
<s>
The	O
NBC	O
did	O
not	O
feed	O
the	O
T4	B-Device
bombsight	I-Device
computer	O
for	O
visual	O
sighting	O
.	O
</s>
