I have an Alltel 8830WE and run the NAV4ALL app instead of telenav. Its free and has voice nav.
No built-in file manager that I'm aware of but I'm sure there is a free one if you look in the right places....for example, start in CB's list of free software.
Posted from my CrackBerry at wapforums.crackberry.com
That's good to know. I just switched from sprint to alltel for the 8330 and was worried i would lose my free navagation. It's nice to know you can still use 3rd party apps.
To get to a file manager, just click on your Media Icon, once that screen comes up, push the BlackBerry button and you get a choice to Explore, which is your file manager.
I'm using an external GPS, because the internal GPS on my Verizon 8830 is disabled. But this setting should be where you select the internal GPS. I can't verify that because on my 8830 my choices are 'Keychain GPS 2000' and 'none.'
Once you've made that selection and saved it, press Menu and select Start GPS Navigation.