Is it illegal to track someone elses car?

Yes and no. In the UK, you can’t place a tracking device in anyone’s car since it’s considered an invasion of privacy.

The person you’re tracking has to give consent, and the car should be owned by you.

That’s true even if Mum and Dad want to track a young driver in order to receive notifications in the event of a collision or incident.

Employees using company cars can be tracked legally, since companies have a duty of care and may want to track vehicles for safety reasons.

In short make sure you have written consent from the driver before installing a car GPS tracker in the UK.

Disclaimer:
This is not legal advice. Please consult your legal team should you require a tracking device.