<s>
In	O
radar-related	O
subjects	O
and	O
in	O
JTIDS	O
,	O
a	O
data	B-Algorithm
mile	I-Algorithm
is	O
a	O
unit	O
of	O
distance	O
equal	O
to	O
6000	O
feet	O
(	O
1.8288	O
kilometres	O
or	O
0.987	O
nautical	O
miles	O
)	O
.	O
</s>
<s>
An	O
international	O
mile	O
is	O
exactly	O
0.88	O
of	O
a	O
data	B-Algorithm
mile	I-Algorithm
.	O
</s>
<s>
If	O
it	O
were	O
exactly	O
one	O
foot	O
per	O
nanosecond	O
,	O
and	O
a	O
target	O
was	O
one	O
data	B-Algorithm
mile	I-Algorithm
away	O
,	O
then	O
the	O
radar	B-Application
return	O
from	O
that	O
target	O
would	O
arrive	O
12	O
microseconds	O
after	O
the	O
transmission	O
.	O
</s>
<s>
(	O
Recall	O
that	O
radar	B-Application
was	O
developed	O
during	O
World	O
War	O
II	O
in	O
America	O
and	O
England	O
,	O
while	O
both	O
were	O
using	O
English	O
units	O
.	O
</s>
<s>
It	O
was	O
convenient	O
for	O
them	O
to	O
relate	O
1	O
data	B-Algorithm
mile	I-Algorithm
to	O
12	O
microseconds	O
,	O
whereas	O
the	O
modern	O
tendency	O
would	O
be	O
to	O
approximate	O
the	O
speed	O
of	O
light	O
as	O
300,000	O
km/s	O
.	O
)	O
</s>
