I had an iPhone 4S for a few weeks last year and tried the Mapquest app. I found that it was terrible when driving down a freeway. Every time I crossed an overpass, it would assume that I was on the cross street, and recalculate. Then it'd wise up to me being on the freeway again, and recalculate once more. Repeat a mile or two down the road at the next overpass.
I would have figured they'd have implemented some heuristic that considered the likelihood of me traveling 70mph in one direction only to immediately turn onto a cross street. But at the time, that seemed to not be the case.
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Have you tried Mapquest? It's had voice nav all this time.
Has the nav on Mapquest gotten any better?
I had an iPhone 4S for a few weeks last year and tried the Mapquest app. I found that it was terrible when driving down a freeway. Every time I crossed an overpass, it would assume that I was on the cross street, and recalculate. Then it'd wise up to me being on the freeway again, and recalculate once more. Repeat a mile or two down the road at the next overpass.
I would have figured they'd have implemented some heuristic that considered the likelihood of me traveling 70mph in one direction only to immediately turn onto a cross street. But at the time, that seemed to not be the case.