I have Ndrive and my recommendation is not to use it. Since GPS is not cheap, get a better quality and pay more as 'poor man pay twice' maxim may be true.

Sometimes, I find that google maps may be clearer.

I bought Ndrive and I think it is pretty useless as it fails at important intersections.

Now I am afraid to throw in the money for another GPS apps as I am afraid their performance will be mediocre.

Seen a dedicated GPS at work and I must say that Ndrive pales terribly in comparison.