I use one most of the time and yet 90% of the time I know where I'm going.
Reasons for using one:
Traffic updates go into the Sat-Nav. Whilst not totally accurate, i can use them as a guide.
Speed Camera/Red Camera alerts. Yes, I do have eyes. No I don't drive everywhere at 100MPH. It's just nice to have an audio reminder
To find POI's (Points of Interest) - Food stops, ATM's, Supermarkets (I work in the food industry)
Well those are my reasons anyway. Oh and for navigation where I don't know where I am...
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