From memory jaguar use Tandy electronics from 1972 for their satnav.
I'd be tempted to update the maps in mine if :
a) The update software didn't just bomb out with an error every time I try to do it
b) It was capable of sending me down roads that don't have grass growing down the middle. Maybe mine has the mud-plugging Land Rover version installed by mistake?
![Wink ;)](http://images.omegaowners.com/forum/smf2000/Smileys/oofstd/wink.gif)
Not had any issues with hers, but hers is the poor mans version (DTM will know the exact designation) that you plug the SD into a computer. I'm guessing yours is the OTA update version?
As for routing decisions, hers is set to default I believe, and slightly favours major roads, and has never taken us a silly route, even if its not always the route I'd personally take.
Biggest gripe is the voice control for the Navigation part seems less comprehensive than I think it should be.
My XJ is the HDD gen2.1, which sadly the maps are no longer available for, and needed a bit (not much, there are only about 3 settings) of config to get decent route planning. My biggest gripe beyond the lack of maps now is the TMC settings aren't granular enough - the options are off, any alert, or very major delays.