Nuvi 310D nightmare

[tattooscooby]

After borrowing a streetpilot to drive through Scotland ( i live in N.Ireland) I went to halfords and bought a Nuvi 310D on Sunday.
Now for the problem, the unit works fine except that is accuracy is appalling !
Driving down the motorway today @ 70mph , turned off onto a roundabout and the nuvi stll showed 0.4 miles until turn-off, I have tried several other routes and I'm past the turn off before it says to turn..
I have updated the firmware to version 2.9 and checked everything else but no improvement.
At this sort of innaccuracy the unit is worthless to me and a total waste of money...
Can someone please help me as I'm about to scream with frustration..... :-(

[swing]

Do you have the GPS antenna flat?

Some people have reported these lag problems, although I don't think anyone has worked out what causes them, or whether it's a faulty unit.

[Rob500]

[tkerby]

Can you go into the main menu screen (keep hitting back) and hit the satellite status button on the top left corner of the screen (looks like signal bars). See how many satellites have solid blue bars and see what the device claims for its current accuracy. It may be that poor signal is causing the lag

Do you have a heated / silvered windscreen? This will affect signal quality

Also, check in your navigation options that you have the vehicle set to car and shortest route or fastest time selected. This improves accuracy by snapping to the roads on the map.

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