How Often Do Nav Dvd's Come Out

[paries]

Hello

I have a 2003 gx with the Nav

I was wondering how often does a updated DVD come out?

Does Lexus contact me?

How expensive is it?

thanks

Randy

[msmith1086]

I have an 01 RX 300 and inquired at the dealer. Installed will be the better part of $500. Ouch.