The phrase "pinpoint him" is correct and usable in written English.
It can be used when you want to identify or locate someone with precision.
Example: "We need to pinpoint him in the crowd to discuss the project."
Alternatives: "identify him" or "locate him."
An airplane and helicopter also worked to pinpoint him.
I could walk in there and pinpoint him myself in the rubble".
"Since he's surrounded by devout followers, there's virtually no chance of the U.S. being able to pinpoint him," he said.
The Navy tried stationing two submarines in the Indian Ocean, in the hope of being able to shoot missiles at bin Laden, but the time lag between the sighting of the target and the arrival of the missiles made it virtually impossible to pinpoint him accurately.
The mountain lion wears a radio collar, but that data wasn't enough to pinpoint him as the culprit in Killarney's killing.
She was suddenly certain that he had raped her; she pinpointed him immediately after stepping into the room.
The Italian police then began intercepting his calls, and pinpointed him to an apartment in Tor Pignattara, a working-class neighborhood scattered with foreigners in southeastern Rome.
In one battered old serai, his guide regales the sinister-looking company with a version of Elliot's life story that pinpoints him as a kind of gnostic saint.
The group of kids pinpointed him for his Sikh appearance--beard, turban and his obvious South Asian heritage.
The indictment against Betonsports pinpoints him as the brains behind a gaming empire.
Better the tenacious modesty of a Matt Lauer, phrasing his questions plainly even as the presidential squint pinpoints him like two beams converging on a target.
