Carbonite actually has a TomTom emulator built in. You can access it by opening Carbonites options
(type "/carb options" in chat, right click the Carbonite minimap button and choose "Options" in the menu, right click a non-icon area of any Carbonite map and choose "Options" in the menu) and then the "General" page. Look for the "Emulate TomTom" option.
You might, also, want to take a look at the
Carbonite - FAQ page.