If you have a limited data plan are you are using your phone as a GPS navigator, then G Maps may not be the best solution for you. You need an onboard Nav app that stores all the maps and POI's on your phone and uses very little if any data. There is a free app called NavFreeUSA that uses OSM maps (free open source community maps. Like Wikipedia but with maps) Its a decent app but not great. One time it told me to go straight where there was a river and I know for a fact there was never a bridge there! I myself bought Sygic ($40 USD) and use it very often and love it! Both of these allow you to download your maps from home on wifi then use them to navigate with no data use. Another benefit of these onboard apps is they will continue to work even if you are in an area with no cell coverage. For my wife's iphone we got Igo Primo for $25 USD and thats a great one too.
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