I believe all you have to do is get the new dvd with the updated maps and switch it out with the one in your car. Its located under the passenger seat i think. Or the Driver's seat, i can't remember correctly.
2004 GX470-NAV and ML system,RSE ,4300k hid kit,K&N Filter, 2 12" JBL 1204 w/ PA3000db amp, 21% tint on front windows
I have a similar question. I just bought a 04 GX470. I have nav and rear dvd. Is there a way to load software or new menus to mimick the 05 GX or even later or can you just update the maps? Also, is there a way to get the DVD to play on Nav screen as well. Looking for some expertise as I'm new to this board. Thanks guys.
Nav DVD upgrades usually only update the maps. Sometimes it may add 1 feature, but usually there are no new features. They never change the way the menus look (ie, to look like newer generation NAVs).
Mine: 2008 GX 470, Nautical Blue, Sport Package w/KDSS, Nav, Mark Levinson, RSES
Wife's: 2004 RX 330, Millenium Silver, black interior, Nav, Mark Levinson, RSES, Gen 3 to Gen 4 Nav upgrade
The recalibration can be done yourself from within the menu I had to do it after my GPS tripped out from placing my xm unit underneath the antenna. Basically it is a little circle and u position it to your current position and direction takes like 30-45 seconds. The upgrade is as simple as inserting the new disk. The newest available is 8.1 I just got a copy of 7.1 but as it turns out now my truck maybe getting totalled by the ins company since there tired of fixing it again and again. If thats the case I will be selling the 7.1 disk for $100 that I got less then 2 weeks ago for $110 should know a little more in the next day or so.