Wiktionary
vb. 1 (context military of an aircraft English) To draw close to a destination, especially using radar; (of a guided missile) to move towards a target. 2 (context idiomatic English) To focus or narrow down to something; to find, draw closer or move towards, as by trial and error or a gradual seeking process.
Usage examples of "home in on".
Reidinger would home in on the required item, give it just the right spin or push to send it out of the net and to the exact place it would spend the rest of its working life in the hull.
That meant only one thing: rockets able to home in on radar beams, even the new shortwave ones Jerry still hadn’.
One of those rockets definitely seems to home in on our radar transmissions—.
There was no doubt that Rhodan had found their positions so quickly because the radio messages from ship to ship had made it easy to home in on them.
On her monitor, she watched a glowing white ball of plasma energy home in on the bullet-probe.
Surely, Mogad or one of his subordinates would try to home in on his voice.
The device which had been implanted under his skin to allow the projector to home in on and retrieve him did return, tucked just in the proper place under the sloughing skin of a decomposing cadaver, which lacked head, hands, and feet.
That meant only one thing: rockets able to home in on radar beams, even the new shortwave ones Jerry still hadn't figured out.
But let's wait until we land, so he can home in on a fixed location.
We can access security discs for the last week or two weeks from the Palace, but it'll take time to pick through them, and luck to home in on our men.
It wouldn't take long, Eve calculated, for Peabody or Feeney to home in on her signal.