Another good tip will help you to prevent your GPS navigator from being stolen. There are three most common mistakes GPS owner makes and if you avoid making it you'll be able to deter people from stealing your device.
Update your GPS Navigator firmware often. This is one of those things that people normally don't do and loose out on more efficient navigation and routs. Companies are always updating and releasing new maps, new algorithms for navigating and new points of interest. It is important to update your GPS Navigator with firmware as often as you can especially if you don't use it often.
Plan your trip on computer and then upload to GPS. It is easier to plan your trip using Google Map and then simply upload to your GPS via "Send to GPS" command.