It app uses Google tiles just like Maemo Mapper does from Google
Streets.  The tiles download from the sellphone data network as needed
and, unlike Maemo Mapper, don't seem to be stored on the limited memory
the iphone has available.  From the pictures when it didn't have a
signal, blank, I'd say it "lacks cache"....(c;

How are you gonna take a trip in the country away from the city or
between cities where ATT has no service on PCS and use the Iphone for
navigation if this is the case, as the test shows it to be.

Don't sell that Tom Tom.....You're gonna need it.

The map app needs some MAP STORAGE and the will to use it.