Originally Posted by Jayhawk
It has worked in the past for me too, but w/ this new DST schedule it looks like we are all going to be changing our clocks manually in the future--unless the Webmaster here is able to re-program the software to fix this. What I do not understand is why wasn't it "fixed" a long time ago--before we got into this mess. After all Congress passed the new DST legislation in 2005!
Given our history at BenzWorld, I know this may sound malicious, but it actually isn't meant to be. However, it's clear that GPS and software development do not fall within your areas of expertise.
Your car does not transmit any information to the GPS satellites, and they are not individually "aware" of your position, which is calculated on the ground by the receiver in your S500. That's why three satellites must be visible for your car to accurately display a position. As somebody else mentioned earlier, your GPS receiver is responsible for applying the appropriate local offset to GPS time, which is measured in the number of weeks and seconds since 24:00:00, January 5, 1980. IIRC, GPS time is ahead of UTC by around 14 seconds. And, as your manual indicates, it is very accurate. It does not, however, provide any information to your receiver pertaining to time zone offsets, including DST.
That brings us to software development, which I'll simplify slightly for readability. In a nutshell, the receiver in your car has software (generally called firmware) that must be patched (upgraded) to restore the proper operation of the automatic DST functionality. This firmware contains the information that is used by your car to trigger the DST changes. Essentially, the updated logic might look a little like this:
If my position indicates that I'm within an American time zone that observes DST, and the date is between the second Sunday in March and the first Sunday in November, advance the displayed time by one hour. If not, then do nothing.
That rule clearly hasn't been updated. In other words, your receiver is functioning exactly as it was designed. The original programmers had no way of knowing in 1998 that DST would change in 2007, and you would probably be complaining about your now deprecated analog Tele-Aid hardware if any time zone updates were sent to your receiver that way. Mercedes-Benz can't push firmware updates to your car from GPS satellites, and they also cannot stop the mobile phone carriers from shutting down their analog towers.
As far as BenzWorld is concerned, there are patches available now for the changes that were made to DST. If they haven't been applied yet, then the forum administrator will probably get around to it shortly. Please rest assured that all of this requires one hell of a lot more effort than your original post implies.