My 2006 xj8 has the original navigation DVD, which is now quite out of date. Looking online, I see DVDs for sale but they appear to be the one I already own. How can I get my nav system info updated?

 

2012 is the last update issued for your car.

The DVD comes up occasionally on Ebay however it can be purchased from Jaguar for around $200.

Do some research and you will find it.

 

Forget the in-dash system, use the mapping app on your phone. As stated before, you'll not get current maps for the car's system.

 

There may be an update for Australia/NZ (but the date is hard to tell)
Jaguar Australia - In-car GPS Upgrades for Australia and New Zealand - powered by TomTomŽ maps (navshop.com.au)

As far as I'm concerned, the in-built navigation is great to have working, provided one accepts 1% of the time there may be new roads, and even then it (as well as standalone stuff) can recommend circuitous routes when I know my area better.
For a specific address not on the map, yeah use your cellphone google maps for free.

The best part of the XJ, is that the boot is large enough to carry a sextant...you know...for navigating by the sun .
(I did that once, no maps no nothing had to get out of Glasgow toward London, used the sun, went up a few muddy farm tracks by mistake but never mind)

Oh, the in-built navigation is presentationally-challenged compared to modern stuff. But never mind - think Classic.

P.S. in researching this by map version, I came across someone who bought a Brand New (Toyota if I don't get thrown out), and the maps were uncurrent at brand new. They complained to whoever you complain to in these circumstances, Consumer Guarantees Act whatever, and got exactly nowhere.