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"In my mind I have gone all over the universe, which may make it less important for me to make piddling little trips... I did enjoy seeing Stonehenge. It looked exactly the way I thought it would look."
- Isaac Asimov

Hypertracer  
  A device that allows a pursuer to follow a spaceship through hyperspace.  

"What is it?"

"A hypertracer."

"That's not enough. I'm not a foundation man. What is it?"

"It's a device to allow the ship to be traced through hyperspace."

"In other words we can be followed anywhere."

"Yes sir."

From Second Foundation, by Isaac Asimov.
Published by Doubleday in 1953
Additional resources -

Compare to the tracer-bird from Changeling (1980) by Roger Zelazny.

Also, recall the homing beacon from the original Star Wars movie.

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  More Ideas and Technology from Second Foundation
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