Navigation (Highway) on iOS

Here's a discussion of terrestrial navigation software on iOS devices (iPod touch, iPhone, iPad):
"Best Turn-byTurn Navigation App for iPhone" @ Lifehacker.

A couple of us are using MotionX, too, although not their turn-by-turn app.

There is surely more to know and to investigate; I just happened to come across the Lifehacker page today.

Mark_
27 December 2011