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Question: real time car on road and nuvi car on map are off. Any fix?

I recently updated my maps on the nuvi. Now my realtime car passes the road before my nuvi car gets to it on the garmin map. This is driving me crazy and several times I have missed or almost missed a turn, because it looks like there is more distance to travel on the nuvi. Before I downloaded, the nuvi was much closer to real time. Is there a fix? Is it happening to anyone else? I know this is a small problem, but it's bothering me. Thanks for any help.