Here is my problem. I have a Nuvi 310. Its firmware is up to date. I had version 9 maps on it. I updated the maps to V10 (2008) a few weeks ago. Everything seemed fine. At the weekend I went from Dublin to Sligo.I used a brand new section of road to test the new maps. The new road was on the unit, but it still routed me on the old road. I ignored this and proceeded onto the new road. Instead of the fimilar "Route Recalculation" voice, nothing happen. It showed me on the new road, but still showed the old route as the one I should be on. Basically it was behaving like the bypass wasnt there ( that it was still a field ). For some reason the unit seems to be showing the new data, but not seeing it for the purposes of route calculation. Has anyone else experienced this ? Any ideas ?