Navigation systems are now the number one item being stolen from cars. Thieves are on the lookout for your suction-cup windshield mount, or even the smudges it leaves on the glass. Here are some tips from GPS Magazine to keep your GPS safe:

• Consider using a friction mount instead of the suction-cup windshield mount most GPS devices ship with. Friction mounts rest on the dashboard instead being attached to the glass, and can be easily hidden under the seat when the car is parked. Plus, there's no revealing ring on the windshield to tip off thieves.

• If you do use a windshield mount, remove it when parking the car and wipe off the suction cup smudge.

Another good idea is to save your GPS's serial number on MyThings so if it is stolen, police will have the info they need to easily identify it as yours.