How the vehicle position is retrieved using VDD

The exact GPS coordinates are retrieved from the Sensus navigation system (IHU unit).

The car must be equipped with Sensus Navigation - GLOBE icon on the dashboard.
https://www.volvocars.com/uk/support/downloads/maps
If the globe icon is missing, the exact GPS position is not available and the position is calculated from the triangulation of the GSM signal with limited accuracy.