Hi! I have been using my iPhone a lot more recently as my dedicated GPS, i honestly prefer it over my TomTom, well because the maps are a lot more updated and also because the voice goes through my car's speakers because of bluetooth. I want to know what kind of hit would this do to my data plan, I have a 10GB data plan and I only use around 2GB a month on average and I do have a car charger, so what would the data hit be? i only use the GPS 1-2 times a month but for a long trip what kind of hit would that be and also can anybody recommend a good car dock, I already have a suction cup on the dash and I do not want to use an air vent car dock only because the vents are such a strange shape that it would almost impossible to fit a phone there, i know i may sound redundant but I just want some advice, thanks! and oh yeah i have a 5S if that makes any difference