Hi Jon,
I've been extremely happy with my approach which was to fork out for the TomTom iPhone app plus a cradle with enhanced GPS. There's a couple of cradles that do this - I have the TomTom cradle ($100 from Apple). I think that Garmin have a similar product. Any iPhone app (TomTom, MetroView, Memory-Map, VMS, MudMap etc) that uses GPS will automatically access the enhanced GPS from the cradle.
Assuming that your iPad and iPhone share your iTunes account you can buy the TomTom app once and use it on both your iPad and iPhone. By doing this your iPad and iPhone function as backups for each other. The TomTom software got upgraded recently so that it fully uses the iPad screen.
Regards,
John.


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