You chart two lines that intersect. When they meet, that's the spot you want.
5 seconds sound clip from Superman (1948) - Between Two Fire (Chapter 10).
You can hear this line at 00:13:21.568 in the Blu-ray version of the episode.
Quote context
[...]
- It sounded like code. But we couldn't read it.
- Two of our friends are being held prisoners. They may be in danger.
- Is there any way we can check these waves back to their source?
- You could use this spare equipment.
- You chart two lines that intersect. When they meet, that's the spot you want.
- I'll go in the car, you stay here.
- Oh, but it'll be dangerous. You don't know what you might run into.
- If I get in a jam, I'll call for help. That's what you'd do.
- You'll be needing this. You know how to work it?
- Now, which way do I go from here?
- Oh, you head south for the start, and we give you directions.
[...]