home in on

ＳＦのThe Martian by Andy Weirを読んでいます。
"Visibility is almost zero," Lewis said. "If you get lost, home in on my suit's telemetry. The wind's gonna be rougher away from the Hab, so be ready."
Pressing through the gale, they stumbled toward the MAV, with Lewis and Beck in the lead and Watney and Johanssen bringing up the rear.
"home in on" は1/15/2009に取り上げているので復習です。前回とは異なる辞書の説明を引用します。 ・Oxford English Dictionary: Move or be aimed toward (a target or destination) with great accuracy.: 'more than 100 missiles were launched, homing in on radar emissions’
・Wiktionary: 1. (military, of an aircraft) To draw close to a destination, especially using radar; (of a guided missile) to move towards a target.
2.To focus or narrow down to something; to find, draw closer or move towards, as by trial and error or a gradual seeking process. He used the clues to home in on the source of the flames. We are homing in on a solution.
Usage notes: The phrase originates in military use in the early 20th century, apparently by analogy with the older term homing pigeon. From the 1960s it is also found in the mistaken variant hone in on.