nav broke?

[blck x5]

my sat nav dosent seem to work it has the nav disk and upto date software
the problem im having is the cars position on the map is wrong
if i input details of where im going and where i am it will plan my route
but not work
wot i mean is its like it would work if i drove in reverse but havnt tried that 1 of course if it shows straight ahead on on the map and i start to drive straight on it will say make a u turn but i need to carry on do u understand what i mean?

[ESS4.6is]

I have had this problem, you have to see the dealer for this. In my case it ended up that the reciever in the antenna was not connecting properly and it was causing my location to be off by about 20km. Hopefully you are still under warranty for it.

[King]

Check the connections to your GPS antenna in the trunk. Could be something as simple as that.

[blck x5]

i took the nav unit and cd changer out to inspect the connections like you said and noticed a small ariel type lead going into the changer
i thaught why have an ariel in a cd player so i plugged it in the nav unit and works a dream
thanx alot