Police are warning motorists in Wrexham and Flintshire to be on their guard against thieves targeting satellite navigation systems.
Non-secured systems should not be left in the car
Across the two counties, 26 vehicles have been broken into since June 1.
North Wales Police have now issued a series of guidelines to drivers.
PC Pete Barrett, community safety officer said: "More motorists are now using satellite navigation systems. We would urge them to be vigilant and take a few security measures."
He added: "The cradle on the dashboard or even the suction cups markings indicate to thieves there may be a satellite navigation system hidden somewhere in the vehicle and that is enough for them to break in.
"The visibility and portability of the latest satellite navigation equipment makes it an easy and profitable target for the opportunist thief."
Drivers are also urged to take portable systems with them when they leave the car - and not to simply lock them in the glove compartment.
Police also suggest making a note of serial numbers, and to park in well-lit places.