It would seem strange for a manufacturer to run two seperate sat nav systems side by side. At least not two seperate software systems anayway.
Wouldnt it make sense to just stick the new software system into the range?
The user interface would surely scale to the screen displaying, just like most software solutions, even if its hard coded, it would be a reatively easy task to recode a software solution for a different resolution.
Unless the Nav system is so highly integrated into the rest of the on board systems, which I guess will be more in depth or complex in the XJ than the XF.
I guess we will see on later deliveries of the XF. :?
Its not as simple as that and thats exactly why they didnt upgrade the XJ nav in 2007 when they produced what we now have in the XF for the XK at its launch and the reason why the X-type still has the 2003 XJ nav. Sometimes they upgrade navigation systems at mid life facelift (witness 2009 Porsche Cayman with newer nav that the 2006 launch) but manufacturers certainly dont change in depth systems like that as a year on year change.
It will be the same with the voice control. Dont expect to see the new XJ "say what you see" interactive voice on the XF anytime soon.
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