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Mobile Safari just doesn't provide enough 2 way data. The only data you would have is when the user clicked play to start the stream. The web page app has no way to tell how far along you are in the stream or how long it took to buffer. And what happens if you need to rebuffer? You can get out of sync quite quickly.
 
Interesting, esp. to see how this shakes out, w/ what they bring to the table. Will say that TeleNav is one of my favorite mapping / GPS's… quite helpful, easy, and accurate. Couple things that I've some qualms about, but it has saved my skin a few times when finding alternative routes due to slow-downs on interstates.
 
True, but HTML5 can do that too

Yes, the TomTom app stores all the maps on the phone, the main reason why the App is 1.7gigs. I bought the TomTom for that reason; if I'm traveling, I'm more likely to have GPS signal than data.

Actually, using manifest="", you can have an HTML5 web app that is available offline (e.g. offline google docs.
 
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