Some types of TomTom navigation devices have a micro-SD card slot that is located on the side or on the bottom of the device.
Before you use the memory card slot, make sure that you have the latest version of the application installed on your navigation device by connecting to MyDrive. When your device is up-to-date, you can use a memory card as extra storage space to add extra maps to your device. Maps can be purchased from tomtom.com.