@Nigel-Ralphson, If you plan your route on the HERE map, differences while navigating can virtually only happen due to traffic. So if you did not encounter any traffic problems, it is a sign that you probably did not plan it on the HERE map, and that you have set way too less waypoints. You may share that route with us, so we can have a look. Without that, I don't see how we can be of further assistance.