I didn't understand your last sentence but it seems impossibile to me that there isn't a way to fix this by mantaining my route. Isn't it possibile to remove the waypoints on the route and "transform" it in a route the seems calculated by the nuvi ( and when there's traffic the nuvi will try to avoid it and the bring me back to "my" route)???
Edit: i read again your answer and understood what you meant but i've already tried that and the nuvi kept recalculating almost until i reached my uni (it was useless of course).
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