My MKIV nav can't see satellites anymore

[Obioban]

I'm at a loss as to what to do at this point. Nav seems to have completely lost the ability to see satellites. So far I've tried disconnecting the battery overnight, then disconnecting the battery and touching the (cars) positive and negative leads together. Neither helped at all.

Also checked to make sure the GPS antenna is still plugged into the nav. It is.

Car is an 2005 e46 M3 with stock MKIV. Extras that get displayed on nav (I don't think this is relevent, but figure it can't hurt to mention) are Stealth 1, Intravee, BMW Bluetooth, and the OEM BMW TV module.

Firmware is the latest with perspective enabled (and pretty much always run in that view), stock except for a custom splash screen.

Diagnostic screens, should they help anyone:










Thanks for any help anyone can give, I'm really at a loss and don't want to have to buy a new nav brain!