Once you enter the destination and it shows you the "overall" map, it is giving you three choices of routes to take. You can scroll through the route options and select the one you want by pressing the big button. Only then will it start giving you directions. If you don't select a route, it will automatically select one for you once you start driving... that is what yours is doing, and that is why it takes a little while for the nav lady to start talking to you.