Thanks, Palandri. GPSInfo, GPSSatellite and others still pick up A-GPS when data is still off, but I think it's pinging off cell towers? I need to do some further troubleshooting that might end up in a hard reset.
I'll keep this thread posted, but I'm not positive of what would've caused this. Seemed fine before Mango. Seemed fine after Mango. I replaced the 16gb SDHC with a 32gb SDCH, and Bing turn-by-turn seemed fine after that still. Navigon USA installation may have been when the issues started for me, but the uninstall does not seem to be helping.
Stay tuned...any other pointers would be greatly appreciated. Thanks again!