It's technically $9.99/mo for the VZ Navigator app (or $2.99 for a single usage that spans 24 hrs). If I recall correctly, Verizon is a bit kinder and doesn't tack on data charges on top of that. AT&T does. You pay $9.99/mo for AT&T Navigator (or $2.99 for a single usage that spans 24 hrs) and then $2 for 1MB of data…