I use my phone (HTC One) for GPS. Since I do field service work, I'm looking for new places all the time. Despite this, I have never had a problem using cell data and I don't have a huge data allowance on my contract.

I used to use a dedicated GPS but the Google maps on the phone is great. It even tells me the exact lane to be in to make exits and turns. Also, the verbal directions are so good that I rarely look at the screen, I just listen to it. I have bluetooth integration to the car stereo and the music pauses when it's giving a direction and then resumes.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250