Police in Derbyshire are warning motorists to look after their satellite navigation systems after an increase in thefts of the equipment from vehicles.
Lap-top computers and sat nav systems are favoured by thieves
More than 100 satellite navigation systems were stolen from vehicles in the county between August and November this year.
In the same period 82 laptop computers were taken, police figures show.
Derbyshire police inspector Steve Wilson said: "These thefts account for about 10% of all thefts from vehicles."
"Although the amount of vehicle crime has fallen, we want to highlight the problem of thefts of satellite navigation systems and laptop computers," he said.
"Our advice is that if you have a sat nav system or laptop you should take it with you when you leave your car.
"If you have a sat nav bracket on your dashboard it will alert thieves to the fact that there may be a system hidden in the vehicle.
Vehicle crime has fallen from 6,136 offences to 5,706 offences in the first seven months of this year compared with the same period last year.