The phrase "a tracker on" is correct and usable in written English.
It can be used when referring to a device or software that monitors or follows something, such as a person, object, or data.
Example: "We installed a tracker on the vehicle to monitor its location in real-time."
Alternatives: "a monitor on" or "a device on".
(Allen has a tracker on Webb, too).
Worried that she might overdose, they placed a tracker on her car.
The ship had a "tracker" on board, the equivalent of an airplane transponder, and was quickly found in the South China Sea.
Coffman knew Cody was at the bar, and through a tracker on his phone could see that Cody's phone remained there hours after the shooting.
Over the whole 21-year period the tracker outperformed cash in a savings account: £10,000 invested in a tracker on 1 January 1995 became £34,098 by December 2015 – a compound growth rate of 6% a year.
Last year the U.S. Supreme Court ruled that police needed a warrant to attach a tracker on a suspect's car.
When deciding on a tracker to implement, the most important information to a researcher is where the tracker is applicable.
"This approach is ill-suited to the digital age, in which people reveal a great deal of information about themselves to third parties in the course of carrying out mundane tasks," Sotomayor wrote in a case involving whether police needed a warrant to place a GPS tracker on a criminal suspect's car.
Last Monday, in a decision seen as a first step toward setting boundaries for law enforcement, the Supreme Court held that under the Fourth Amendment of the Constitution, placing a GPS tracker on a vehicle is a search.
The story here is that someone secretly affixed a GPS tracker on a Google Street View camera car and you can follow the car's progress using Google Maps while it's photographing the streets of Berlin.
This paper presents the design and implementation of a feature tracker on an embedded reconfigurable hardware system.
