I don't think you get any better accuracy - or if you do, you don't need it. Generally you lose accuracy when the GPS antenna starts to fail. When it's working properly, the onboard Sat Nav is pretty accurate.
Here's how I replaced my OEM one when it failed: http://forum.a8parts.co.uk/showthrea...1510#post21510
Very cheap and very quick, but I wouldn't bother it I didn't have to.
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S8 V10, 2006, Daytona
FFRR 4.2 SC, 2006, Black
Putting squashed dinosaur world to good use.
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