PaulT.
So, press start/stop without using the brake pedal to turn the ignition on.
When the screen shows its home menu, Press the Navigation screen button.
Press destination entry.
Press and hold the colon after the word “entry”, at the top of the screen till the screen changes,
to two columns of buttons.
Press “parts information” top of left column, the screen will change again.
At the bottom there will be 3 groups of 2 digits.
The middle two are the year of the mapping info.
Ignore the back button. It only goes back to the two column screen,
if you have had a look at the other options.
To get out of this “hidden” menu/info, you lock the car, wait approx a minute,
unlock car and start the engine system boots up normally.
My XF is a ‘14 yr model, made in ‘13, which I bought in ‘19,
it still had the ‘13 mapping loaded.
Hope that helps.