:02:04
Our receivers pick up that sound
from the oscillator...
:02:07
which enables us to cross-plot
their exact position.
:02:10
For example...
:02:13
suppose the impulse received here...
:02:16
has a bearing of 210 degrees.
:02:19
This one here reads 45 degrees.
:02:23
We plot them like so.
:02:25
Where the lines cross,
that's where they are.
:02:28
It doesn't matter how far they travel.
:02:30
As long as our cars
are within receiving distance...
:02:33
we can tell where they are.
:02:34
Switch it off.
:02:36
How far is receiving distance?
:02:38
We had a dry run on a car yesterday.
Kept tabs on him for 20 miles.
:02:42
That little thing?
:02:43
You can make one out
of your bedside radio. I'll show you how.
:02:46
When you've got a week to spare,
Ernie'll tell you all about electronics.
:02:49
We'll meet at the airport in 40 minutes.
Be in Springfield late this afternoon.