There have been some inconsistent reports in this thread: http://www.teslamotorsclub.com/showthread.php/40262-How-rare-are-Model-S-without-the-Tech-Package about owners being able to purchase the Navigon Turn-By-Turn Navigation feature, separate from the rest of the tech package, after delivery. Prices from $200-1000 have been quoted and there are unconfirmed pre-requisites such as the upgraded sound system which apparently puts more memory behind the center stack screen. Just wanted to put this up in a separate thread to see if we can get further information on what the specifics are and let any Non-Tech owners out there know about this potential option. As a Non-Tech owner myself I'm on the fence, wasn't missing the navigation before, but if the new features are included the value proposition changes. Anyone who has contacted Tesla about this please share.