After the ID1 update, I noticed that I could no longer use my Epix aGPS with Garmin XT or Google Maps. It simply would not connect with any GPS Sattelites. I used GPSTest, and it just hung at “Starting Up GPS”. This is a fairly common problem after the update from what I hear, so I wont go into any more detail. Here is how I fixed it:
1) In my case, I re-performed the update. I think this step is unnescessary, but if the next steps don't work for you, try performing the update over again, doing a hard reset, then picking up @ step 2.
2) Go to Start-> Settings ->System and select “External GPS”. Use the following settings: GPS program port: COM4, Hardware Port: COM9, Baud rate: 4800, Manage GPS Automatically.
3) Install AT&T Navigator. You can download it from here:
http://otacdn.telenav.com/nav/…..1.3.17.cab
It appears that once you install AT&T's gps program, your GPS will function properly. Once it is installed, go ahead and run it, it will ask you for a first and last name, and will give you an arbitrary pin code. This is for the free trial of their software. Go ahead and connect to their service and verify that your gps is working properly with Telenav. If it is, go ahead and exit AT&T Navigator.
4) Go to Start-> Settings ->System and select “External GPS”. Verify that the Program port is still set to COM4. Close settings.
5) Open GarminXT. It should automatically detect the GPS and begin working, but if it doesnt try clicking the scroll icon or the empty bars, and click disable or whatever until you get to the screen where you select your gps port. Select Serial -> COM4. You may need to close and re-open Garmin or restart your device.
Hopefully this process will work as well for you as it did for me, since it was a REAL pain not having my GPS for a few weeks…. but ymmv! 