Any one know what is the latest nav rev for a 98-00 GS/LS?

Also how much later than the version date does it become available at a dealer?

 

Rev month has been September each year (I have had '99, '00', and '01) and it hits my dealer around the end of the year. I didn't get '02 yet - I'm happy with '01 and will probably jump to '03 when it comes out.