Navigation system, method and device with detour algorithm

A navigation aid method for performing a detour route calculation, comprising:

• dynamically receiving data relating to a portion of a particular thoroughfare in a route;
• calculating a new route to a desired destination with a preference for avoiding the particular portion of the thoroughfare in the route;
• and
• wherein calculating a new route to a desired destination includes calculating a second new route different from a first new route, wherein the first new route is a first detour route, and calculating the second new route includes calculating the second new route with a preference for avoiding a particular portion of a thoroughfare in the first detour route and the particular portion of the thoroughfare in the route.

A navigation system with route calculation capabilities, comprising:

• a server having a processor and a memory, the memory having cartographic data and a route stored therein to navigate from a beginning position to a desired destination, the cartographic data including data indicative of thoroughfares of a plurality of types, the route including a number of decision points;
• wherein the processor operates on a route calculation algorithm and dynamically received data relating to a portion of a particular thoroughfare in a route in order to calculate a new route;
• and
• wherein the memory stores previously selected route preferences for use in calculating new routes.