I posted this in a different thread on the subject as well, but here seems like a more appropriate place.
FWIW, I didn't need to upgrade to the Rogers OS to get this to work. I am still running the stock Cingular v.4.2.1.72 (Platform 2.3.0.54) on my 8800 and TeleNav v. 5.1 installed and works just fine on my device....
I went to
TeleNav
Works swimmingly. The upgrades are not insignificant. The incorporation of traffic info is huge, but minor changes (like the addition of an ETA) are also very nice. I'd still like to see a compass added to the navigation screen, but what'cha gonna do?
Someone else mentioned that you could tell it to avoid certain roads and/or route segments, but I can't figure out how to do that. That sort of a "detour" function would be awesome!
Finally, someone else was looking for a good car mount (I believe, the technical term was "suction cup thingy"). I use the Bury Technologies found here:
Amazon.com: Bury Technologies Comfort Cradle for RIM Blackberry 8800: Cell Phones & Service I had someone "hardwire" it to the car, so the power cord runs back through the dash. It works great!
--Mav