If you're getting a green CD icon and a green satellite icon, and the location on the map is generally where the car actually is, then the sat-nav is fine. The diagnostics are exactly that: A means of diagnosing a problem if you actually have one. If you don't have a problem then you can ignore them.
Hi Horatio -
Thanks for the quick reply.
Yes, I have green cd and satellite symbols.
So, are you saying these messages only relate to the sat nav and not the car itself? Sorry if this is a dumb question but I assumed that seeing as the messages related to reverse gear, etc, that it was some sort of car check?
If it's just sat nav related then I guess I can sleep easier.