There are several products out now for the iPhone (and some for the iPod Touch with a little hardware help) that will let you use your device as a GPS navigation unit, complete with turn by turn directions. Tom Tom and Navigon are a couple of the leading suppliers of software. There are some free alternatives, too. One that just became more of a contender is MapQuest 4 Mobile. MapQuest 4 Mobile is a free download, and a couple of days ago they added voice to the turn-by-turn directions.
This means unlike the in-built Maps application, you can concentrate on driving and just listen for your turns. So how well does it work? To find out, I decided to use it to drive to work while also running my Garmin Nuvi 765T. Now, I didn't expect it to blow away the Garmin – the Nuvi was somewhat expensive when I bought it last year (around $380) and the MapQuest app is free. But I wanted to see if it was at least passable should I be without the Nuvi.
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