Daylight Savings Time? - Page 2 - Mercedes-Benz Forum

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post #11 of 63 (permalink) Old 03-10-2007, 11:37 AM
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Originally Posted by Jayhawk
Yes. I looked at my COMAND manual and it said my car's clock is automatically set by GPS. There is a Manual set mode too, but they said that was used when the car battery had been disconnected. Otherwise it should be automatic. I now think "our definitive answer" will come tomorrow after I start the car...
Thanks for the info. I'll start the car before trying to do anything with the clock, that's for sure. The "With COMAND" instructions were hard for me to follow last year and I think it took about 30 minutes!

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post #12 of 63 (permalink) Old 03-10-2007, 11:41 AM Thread Starter
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Thanks for the info. I'll start the car before trying to do anything with the clock, that's for sure. The "With COMAND" instructions were hard for me to follow last year and I think it took about 30 minutes!
Tip: Starting the car may not be sufficient to "see" the GPS. I usually have to drive a short distance for the clock to automatically reset. So go some place before you revert to the manual reset. Let us know what happens.

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post #13 of 63 (permalink) Old 03-10-2007, 11:44 AM Thread Starter
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BTW Musikmann: I think we have to have a NAVigation system to have the GPS tracking/time function. If you just have COMAND, you may not have GPS capability...

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post #14 of 63 (permalink) Old 03-10-2007, 11:49 AM
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Thumbs up Comand/nav

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Originally Posted by Jayhawk
BTW Musikmann: I think we have to have a NAVigation system to have the GPS tracking/time function. If you just have COMAND, you may not have GPS capability...
"Fortunately" I have the COMAND/NAV. Thanks for the tip about driving around. Benzie (and the GPS antenna) is always parked underneath a metal carport so that could very well interfere with the satellite signal. I'll post the results by about 12 noon EDT.

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post #15 of 63 (permalink) Old 03-10-2007, 11:57 AM
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There was already a partial answer. The GPS system does not provide information about local summer time changes, that information must be stored and managed by the GPS receiver.

The GPS time is one of its own, GPS time was zero at 0h 6-Jan-1980 and since it is not perturbed by leap seconds GPS is now ahead of UTC by 14 seconds.

GPS does send the offset to UTC, once the receiver has obtained this info, it is able to adjust accurately to UTC. Even leap seconds every now and then at new year time can be handled, once the new UTC offset has bee received.

Now even if the GPS receiver knew the exact UTC, it would need local information about the time zone and summer time. A new navi disc probably would make the car aware of the US summer time changes.
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post #16 of 63 (permalink) Old 03-10-2007, 11:57 AM
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A senator just recently pushed that DST be changed to an earlier date. Before and when it goes into effect, the whole world has to change it. They're not going to do it instantaneously.
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post #17 of 63 (permalink) Old 03-10-2007, 12:53 PM
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Correction email sent

This began with: Dear Musikmann,

We regret that our prior email did not direct you to the clock change instructions for your Mercedes-Benz. <snip> I don't understand this because I found the intructions the other day and printed them. As before, they explain the procedure for 3 different configurations:

Setting the clock using the multifunction steering wheel — vehicles without COMAND

Setting the clock using the COMAND controls

Setting the clock for vehicles without COMAND and without GPS

[edit] Hell, the 2 sets of instructions are different, at least for those using the COMAND controls!

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Last edited by Musikmann; 03-10-2007 at 01:00 PM.
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post #18 of 63 (permalink) Old 03-10-2007, 12:54 PM Thread Starter
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A senator just recently pushed that DST be changed to an earlier date. Before and when it goes into effect, the whole world has to change it. They're not going to do it instantaneously.
The rest of the world has already (last year) said that they will not adjust to our new DST, which is wreaking havoc w/ the international airline schedules--among other things. They are screaming bloody murder. Which may explain why the GPS are not picking up the new DST...

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post #19 of 63 (permalink) Old 03-10-2007, 12:56 PM
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Unhappy Navi disc

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Originally Posted by Diesel Benz
...Now even if the GPS receiver knew the exact UTC, it would need local information about the time zone and summer time. A new navi disc probably would make the car aware of the US summer time changes.
Well, I guess that eliminates me because my CD is from 2005.

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post #20 of 63 (permalink) Old 03-10-2007, 01:03 PM Thread Starter
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Originally Posted by Musikmann
This began with: Dear Musikmann,

We regret that our prior email did not direct you to the clock change instructions for your Mercedes-Benz. <snip> I don't understand this because I found the intructions the other day and printed them. As before, they explain the procedure for 3 different configurations:

Setting the clock using the multifunction steering wheel — vehicles without COMAND

Setting the clock using the COMAND controls

Setting the clock for vehicles without COMAND and without GPS
That is exactly what mine said too, but I never received a "prior email..."

I think they are just trying to CYA because they know they are going to have a bunch of pissed-off owners next week when our clocks are all off by one hour.

The more I think about it I don't believe the satellites are going to reset because the US is the only (idiot) nation to make the change. GPS are international and no one else is making the switch but us/US. Which means that we all will have to do a manual reset tomorrow. Just my guess... Now I'm starting to wonder what happens when the old (April) DST date arrives... Will our cars be an hour ahead?

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