SATELLITE navigation systems have become the latest must-have target for criminals.
Police have seen a huge rise in the number of the expensive high-technology gadgets being stolen in recent months.
And they have urged drivers never to leave them in their cars - especially in the glove compartment.
West Yorkshire Police crime reduction officer Det Insp John Minary said: "This is the first place thieves look.
"Since September nearly 300 satellite navigation systems have been stolen in West Yorkshire. These are expensive and thieves are on the lookout for ones that have been left in cars."
He added: "They are switching tactics from stealing the vehicles themselves to taking the satellite navigation systems instead.
"Increased car security such as immobilisers and trackers are making it more difficult for vehicles to be stolen, whereas portable satellite navigation systems are relatively easy to remove and not security coded in the way car hi-fi systems are."
Police across the county will be pushing car crime prevention over the next couple of months in a campaign called Steer Clear.
They will be visiting shopping centres and supermarkets across the county delivering crime prevention information and urging them to broadcast crime prevention messages over public address systems.
Officers will also be monitoring the region's roads using the Automatic Number Plate Recognition system which immediately flag up any vehicles linked to crimes or offenders.
Drivers have been urged by police not to leave any Christmas shopping at all on show in their cars.