I know there is an app called syngic, where you can have pre-loaded maps on your sd card. google is starting to do the same thing with the ability to dowload maps for offline use. you can still use offline maps for gps nav.
I know this is not exactly what you asked about, but there are other apps that let you use a phone as an offline gps. I'd try something else if TomTom won't help you make their app work well right NOW.
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