well I'm not deaf but if the the internal receiver is a full GPS and the maps are stored locally then you should have a fully functional mapping solution with the exception of real time traffic and weather updates. That's really all I need as I have the laptop on a travel station in the work vehicle with GPS and a big screen. Data plan may happen at some point but I simply don't use my phone the way most of you do. It is simply a tool to check email on the road and receive phone calls. If my usage changes then I will consider giving ATT another $500/yr. I am also looking at how the Act! integration works, which could change my needs. My minutes average under 200 a month. My wife averages 10. I currently have about 3K roll over minutes. That should give you an idea of why I really have yet to see the need for the data plan. Honestly the best argument for an unlimited data plan is as an emergency connection for the laptop. I understand what it's like to see a newb ask the same question for 1000 time and I generally search quite thoroughly before I post. In this case my searches did not give me the specific answers I was looking for. Thanks for the help.