My car's GPS NAV system knows the time, so how does the clock get set?

Audi/VW's RNS-E unit. I bought it with the new car so I could leave
the GPSV on my bike. =20

After I disconnected the car's battery, I found that the clock in the
instrument cluster, and the one on the NAV screen were wrong. (as
expected) I waited a couple days for it to set itself from the GPS
sats. 2 days later, and the time and date were still wrong. =20

Pull out the owner's manual, to find that I need to set it via a
pull/twist knob on the cluster, MANUALLY, like on my old car, and then
the time/date info is transmitted over the CAN bus to the NAV unit,
which then dispays it on-screen.. =20

Dumbest thing ever.. The instument pod "knows" there's a NAV unit
with GPS, which also knows what time zone it's in. Obviously, the
cluster should get the time and date from the NAV box, not the other
way around. =20

And, the street detail vs zoom level can't be adjusted, You don't see
surface streets until the zoom is down to 600 ft, making eyeball
detour routing impossible, since you can't see where the small streets
go...

One big dumb mark for Audi. (and another for me for buying this this
thing instead of a better GPS..)
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Hi Doug,


No it doesn't know which time zone you're in. If you go just over a
Country (EU) or State (USA) border you don't want the NAV unit to
suddenly display a different time to the clock in the instrument
cluster. In the USA some States are still deciding which time zone
they're in - sometimes it even depends on which County in the same
State!

http://www.cnn.com/2005/EDUCATION/08/11/extra.daylight.savings/index.html

The USA switches to Daylight Saving Time on a different day to when we
in the UK switch to British Summer Time. Some Countries don't switch
at all.


A good point. But the instrument cluster will brobably be made the
same whether it's to go in a model fitted with a NAV unit or not. It's
also still got to work if the NAV unit is broken, stolen etc. And
you've still got to tell it what time zone you want displayed.

All the best, Eddy [UK]