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I have a Garmin GPS 276Cx.When I set up a route on automotive then view map page I find tat the route is drawn as a straight line from starting point to destination..I want to drive to destination but route doesn't use the roads available just draws a straight line.I have selected automotive in set up/system.Set activity to automobile driving in routing.Set position format to Irish IG in location.I have been through all the menus but the route will not follow the roads.