I have bought an iPod touch 4g and installed TomTom Europe app. How do I get a decent GPS signal, since the TomTom carkit doesn't do the job?

I have bought an iPod Touch 4g and installed TomTom Europe GPS app. How do I get a decent GPS signal in my car, since the TomTom car kit for Ipod Touch doesn't do the job for the ipod Touch 4g?

Your only way is if you have the version that was compatible on your computer such as in the recycle bin/trash or in a computer file backup. In that case delete the current version that is in your iTunes App library and replace it with the older version. Then sync.
Also see:
Recover Older Versions of iPhone Apps After Updating — Apple News, Tips and Reviews
The bakup that iTunes makes does not included synced media like apps and music.
If you still have the one 2G with the Netflix app, delete the new NetFlix app from her computer anf then transfer iTunes purchased to the iTunes library by:
iTunes Store: Transferring purchases from your iOS device or iPod to a computer
Then sync to her iPod. You may have to sign the iPod into the account that purchased it to sync it.

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