Not sure if the old os allowed this, but I noticed on the main BB help browser webpage on the download section there was BlackBerry Maps available for download..... So I downloaded it and installed it.... One word... Sweeeeetttt.....
It uses the internal GPS and does routing and such!!!! Pretty bad ass deal for people that wouldn't use that function enough to warrant Telenav.... It's a very functional program once you realize the price..... Zero dollars...
So yeah, I'll give it a shot tomorrow and see how it keeps up. But I thought I'd let you know of a potential postive. Perhaps you can see if you can download the maps software to your BB? You can even click on someones address book entry and choose "Map Home" or "Map Work"... Slick...
If you don't have a link to it, enter this in your BB Browser:
http://www.blackberry.com/maps