Hate to say it but probably the Stealership.
It depends what year your Lexus is. Also, apart for the generational breakdown, there are version breakdowns, meaning you can have an older generation nav in your Lexus, but update to the newest map with updated POIs and addresses.
Pay for a map update subscription.
I bought myLEXUS ES350 2007-2009 NAVAGATION DVD UPDATE 2011/2012 V.11on eBay fromlexusofnorthmiami
Buy the CD from Lexus and insert it into your CD player
I believe the LX570, like the LS460, uses a hard drive to store the Map data and needs special equipment to load the DVD Update on to the hard disk. You probably will need a half hour installation service from your local Lexus dealer.
when is the next bing map update
Check Magellan website. They recently released a map update plus upgrading it to a cross-over gps...
How to update GPS maps This article will provide you with the information on how to update maps on your GPS system. If you are not sure whether your map is up to date, this article will teach you how to update it conveniently. The process of updating your map may be different depending on which type of vehicle you drive, but the steps are mostly similar.
The original map variant was created by Eul, but he did not update the map. Steve "Guinsoo" Feak, would later create a version and update the map for 2 years, then handed the project off to Icefrog who has been working on Dota since 2005.
no you have to have the update
Most maps will be updated, adding improvements. However these can only be downloaded via the forum post or other external download site provided. you cannot get a map update from ingame.