Hoping someone can help.
A friend of mind asked that I swap his version B RNS 510 for a newer P unit on his 58 plate Golf estate with external shark fin aerial and Highline screen which gave nav directions.
The installation went well and the unit works perfectly. However, the directions no-longer show on the Highline display. As nav was already installed, in the car, I would expect the car was coded correctly for it to work previously?
Any ideas what it could be?