navi showing incorrect position - Page 3

KiwiJochen · #21 09-22-2007, 09:38 AM

My guess would be the GPS reference clock is out.

You can try by replacing the GPS receiver (it simply plugs in) - try swapping it from the good Mk3 to the new (bad) Mk4 and see if it makes a diference.

If the replacement GPS receiver doesn't fix it then the problem is on the main board - maybe there is a reference clock which is off-frequency.

You could consider sending it to VDO in Wetzler Germany for repair, or sell it for spare parts.

Regards, Jochen

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Demon31 · #22 09-22-2007, 12:51 PM

where is the gps receiver? is it inside the unit?

KiwiJochen · #23 09-23-2007, 03:45 AM

Quote:

Originally Posted by Demon31

where is the gps receiver? is it inside the unit?

Yes, take the top lid off, and you can see the GPS receiver as a metal-cased module. It is physically held on by the nut on the GPS antenna connector.

Take the nut and washer off the antenna connector, unplug the wiring connector on the GPS receiver, and it comes out quite easily.

BabyMakingWeather · #24 10-07-2007, 09:56 AM

Quote:

Originally Posted by Demon31

yea i have. and i did it while i was downtown manhattan where the streets are criss crossed and really close together, it really messed me up. it blatantly put me on the strong street. i had to look at the map and figure it out on my own.

Sounds like multipath error (http://en.wikipedia.org/wiki/Global_Positioning_System#Multipath_effects). Check your antenna, and also see if the problem persists when there are no buildings around.

BabyMakingWeather · #25 10-07-2007, 09:59 AM

Quote:

Originally Posted by KiwiJochen

My guess would be the GPS reference clock is out.

Won't the GPS unit always synchronise its time with the atomic clock in one of the GPS satellites? (http://en.wikipedia.org/wiki/Global_..._time_and_date)

KiwiJochen · #26 10-07-2007, 01:43 PM

Quote:

Originally Posted by BabyMakingWeather

Won't the GPS unit always synchronise its time with the atomic clock in one of the GPS satellites? (http://en.wikipedia.org/wiki/Global_..._time_and_date)

I understood that local clock errors can contribute to GPS error

But maybe I am wrong...??

Irish M5 · #27 11-07-2008, 02:24 PM

Did the OP ever get this resolved? Would like to know the answer.

Demon31 · #28 11-07-2008, 02:33 PM

nope. i just put my old unit back in

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