That's confusing. Earlier you were talking about Entune's traffic interface with nav and now you say you don't have it? Traffic interface with Nav is a key functionality. A must have option in my view. Had I known that the Prius 6" XM/Nav package could do XMNavTraffic, I would have gone for a Prius IV with the higher end XM radio which can get XM Data Services (Traffic, weather, etc). Toyota's idea with 6" and Entunes provided internet based traffic via cell phone is to see if they can capture the $15 a month that XM charges for the traffic. NavTraffic via XM is the better way to go. Cheaper. More reliable. No usage of data services. No roaming charges on trips. No "no service" issues. That said, Entunes Traffic does the job but requires monitoring for data usage.