After creating a route in route planner or Tyre and installing on Rider 410. Why does the sat nav sometimes send me on a pointless wild goose chase off route. Today it sent me on a circular route down a lane and back to a point where I left it. I can understand if I went off track it would re-route me back but it randomly sends me down roads not set on the planner. The other thing is it doesn't always re-route me back to original route if I go astray. I thought the idea of planning a route would be for the sat nav to follow but this isn't always the case.