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Originally Posted by Demon31
the images are on the previous page. my PDOP bounces between 2 and 5 during driving. i just put in my old mk3 navi and it started giving me accurate position after about 5 minutes of street driving. i've driven a good 100 miles mixed city/highway on the mk4 navi and still it sucks. could it just be a bad receiver?
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Your old Mk3 was still calibrated to your car.
To test the receiver accuracy, park the car, note the level of GPS PDOP with the Mk3, and write down the lat(long from the service menu
Then fit the Mk4 without moving the car, and wait for it to acquire good GPS position
Compare the two.
I'd guess the GPS receiver is OK but maybe the gyro is faulty... what does the gyro say? It should have a mid value of around 2500 mV, and go up when turning right (to over 3000) and down when turning left (to <2000), and stable at 2500 when going straight ahead.
Or otherwise the speed pulses are not yet calibrated... compare your speed pulse readings with another Mk4 in a similar car (do you have an X5?)
Jochen