GPS offtrack

[Oliebol]

Dear all,

My mother in law owns a F900BT with which she never had any issues till recently.
All of a sudden the GPS position is a few hundred meters of.

With her car parked in front of her house, the AVIC believes she is @ different location

Navigating still works, but is without any use if the AVIC does not know the correct location

So I guess the GPS must be recalibrated.
Found service manual suggesting GGV1322 Service Test Disk and GPS receiver test

****
1. Copy a "TestMode" folder under “TestMode” folder on GGV1322 to a SD card.
Note: "TestMode" folder must be on the SD card root.
2. Download a ID file from the Service Site and copy the file to the "TestMode" folder on the SD card.
****

 

Anyone who can link me STD ?
And where do I get the ID file from ?

 

Thank you very much for your help
Jurgen