The theft of portable satellite-navigation units is dramatically increasing in many places. ...
Even people who take their GPS gadgets off their dashboards when they leave their cars are returning to find windows smashed, as thieves gamble that an empty plastic cradle suction-cupped to the windshield means a GPS unit has been hidden somewhere in the car. ...
It gets worse: Taking the plastic cradle off the windshield might not be enough if the suction cup leaves a ring of film on the glass. That alone can signal a thief.