You can even use TomTom on the iPhone.[1]

Because it remembers your previous locations it makes menu navigation easy. Errors are virtually impossible with the simple layout. TomTom also has voice directions that correct the errors you make while driving and redirect you to where it is that you want to go. Retention
is maintained after a few weeks of traveling.

Eight Golden Rules

Golden Rules TomTom
Is consistent 5
Caters to universal usability 5
Offers informative feedback 5
Provides dialogs that yield closure 5
Prevents errors 5
Permits easy reversal of actions 5
Offers support for internal locus of control 5
Reduces short-term memory load 5
Total Score 40
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