Wis. Stat. § 940.315: Global positioning devices.

(1) Whoever does any of the following is guilty of a Class A misdemeanor:

(a) Places a global positioning device or a device equipped with global positioning technology on a vehicle owned or leased by another person without that person’s consent.

(b) Intentionally obtains information regarding another person’s movement or location generated by a global positioning device or a device equipped with global positioning technology that has been placed without that person’s consent.

(2) This section does not apply to a motor vehicle manufacturer or a person, acting within the scope of his or her employment, who installs an in-vehicle communication or telematics system, to a device installed by or with the permission of the vehicle owner for automobile insurance rating, underwriting, or claims handling purposes, to a law enforcement officer acting in his or her official capacity, to a parent or guardian acting to track the movement or location of his or her minor child or his or her ward, to a lienholder or agent of a lienholder acting to track the movement or location of a motor vehicle in order to repossess the motor vehicle, or to an employer or business owner acting to track the movement or location of a motor vehicle owned, leased, or assigned for use by the employer or business owner.