<s>
A	O
flight	B-Device
computer	I-Device
is	O
a	O
form	O
of	O
circular	O
slide	O
rule	O
used	O
in	O
aviation	O
and	O
one	O
of	O
a	O
very	O
few	O
analog	O
computers	O
in	O
widespread	O
use	O
in	O
the	O
21st	O
century	O
.	O
</s>
<s>
Sometimes	O
it	O
is	O
called	O
by	O
the	O
make	O
or	O
model	O
name	O
like	O
E6B	B-Device
,	O
CR	O
,	O
CRP-5	O
or	O
in	O
German	O
,	O
as	O
the	O
Dreieckrechner	O
.	O
</s>
<s>
They	O
are	O
mostly	O
used	O
in	O
flight	O
training	O
,	O
but	O
many	O
professional	O
pilots	O
still	O
carry	O
and	O
use	O
flight	B-Device
computers	I-Device
.	O
</s>
<s>
In	O
the	O
air	O
,	O
the	O
flight	B-Device
computer	I-Device
can	O
be	O
used	O
to	O
calculate	O
ground	O
speed	O
,	O
estimated	O
fuel	O
burn	O
and	O
updated	O
estimated	O
time	O
of	O
arrival	O
.	O
</s>
<s>
One	O
of	O
the	O
most	O
useful	O
parts	O
of	O
the	O
E6B	B-Device
,	O
is	O
the	O
technique	O
of	O
finding	O
distance	O
over	O
time	O
.	O
</s>
<s>
On	O
the	O
main	O
body	O
of	O
the	O
flight	B-Device
computer	I-Device
it	O
will	O
find	O
the	O
wind	O
component	O
grid	O
,	O
which	O
it	O
will	O
use	O
to	O
find	O
how	O
much	O
crosswind	O
the	O
aircraft	O
will	O
actually	O
has	O
to	O
correct	O
for	O
.	O
</s>
<s>
The	O
back	O
of	O
the	O
E6B	B-Device
is	O
used	O
to	O
find	O
ground	O
speed	O
and	O
determine	O
how	O
much	O
wind	O
correction	O
it	O
needs	O
.	O
</s>
