I think the "lag" isn't Sygic's fault since Ovi Maps is also 10-50m behind the real position all the time.

It must be some sort of delay between GPS-driver -> program which parses the info and displays it on the screen.

I'm going to buy this program as soon as it's available via Sygic's Shop. I've used Sygic in the past with my E90 & N97