You just said it, TELENAV! The at&t does not use Telenav. It has it's own gps built in. You can install any other gps software made for that phone, and rock out for free. Example, you could install a tomtom mobile gps software onto the phone, with maps included, and receive no charges for data, because there is nothing to download.
GPS DOES NOT COST MONEY IN THE UNITED STATES. IT ALSO DOES NOT USE DATA or NEED IT ENABLED.
GPS, IS GPS, IS GPS, IS IT'S OWN THING.
Hope I was able to explain it.
GPS, is free.... what At&t is charging 10 bucks for is telenav. Telenav has to download the maps peice by peice each and everytime you move, where other software already has the maps on screen and ready. Telenav is a total rip-off. That's why you saw people with pay per use charges, because telenav had to use data to download the maps.
The tilt, has a working gps, and if you install the maps, theres nothing to download. I'm not a "rare or unique" situation...... i'm one of about 500,000 people who are smart enough to just not pay At&t for something that was included for free.
By using telenav, in any way shape or form, you're screwing yourself over. With, or without a data plan.