Satnavs will only give you a choice of route between two points that they are programmed to give. That can be 'fastest', 'shortest', 'avoiding motorways', etc, and for truck drivers and caravanners, 'avoiding narrow lanes, pinch points and low bridges'. But if you want to take an indirect route or visit places between A and Z you can programme the route using 'waypoints'. So you would go, for example, from A to F, then from F to M, then from M to T, then from T to W, then from W to Z. TomTom, Garmin, etc all allow you to do this.