Police are warning satellite navigation system owners to remove them from parked cars after a series of thefts.
Thieves are removing the kits from cars across Notts
Thieves have targeted cars and vans around retail parks and city streets in south Nottinghamshire - taking the sat-nav systems left on show.
Police are dealing with three thefts a day of the £500 systems, which are often left on the dashboard.
Kevin Brown, Crime Reduction Manager, said: "Leaving them on show is an invitation to the criminal to steal."
He added: "We need people to take responsibility for their belongings and remove them.
"The satellite navigation systems are made so that they can be taken with the owner whenever they leave their vehicles. Don't become a victim, take your things with you."
Crime reduction colleague Peter Ainley said: "We are working with retailers to highlight the pitfalls of leaving a satellite navigation system on display to any potential customers."
Satellite navigation systems are one of the latest gadgets being used by drivers where a voice and moving map directs drivers to locations.
The computers can pick the best routes as they hold maps and use satellite technology to pinpoint a location and help drivers complete their journey.