What is the latest NAV version that will work perfectly in my DVD based 2001 GS430?

 

you have a gen 2 computer. the latest update is the 2008 model year 7.1 data dvd disc which has the name gen 2/3 update disc cy08 meaning calender year 08. do not buy gen 4 or gen 5 update discs. the part number written on the disc is 86271-33036 but dont ask the dealer for that number or the price will be 900.00. the dealers sells it with the pt gen2/3 cy08 which is printed on the sticker of the bubble wrap package it comes in in his accesory parts catalog not by the toyota part number written on the disc. the bubble wrap part number is not written on the disc only on the sticker on the bubble wrap. . the accesory price is around 300.00. the part number thing is quite confusing but just an attempt to discourage you from buying one somewhere other than the dealer.