Navigation system

A personal navigation device comprising:

• a processor to perform, by software installed on the personal navigation device, route calculation and subsequent navigation functions;
• a graphical display;
• a memory;
• map data stored in said memory;
• a user-input device;
• and
• a signal receiver to receive one or more wireless signals so that the processor can determine a present location of the personal navigation device in conjunction with a user input desired destination information,
• wherein said memory includes one or more fuel-related parameters, said route calculation function utilizes said one or more fuel related parameters to return fuel information representative of a fuel cost of a particular calculated route, repeating said route calculation function during navigation along the calculated route to return an updated fuel information representative of an updated fuel cost for a remaining portion of the calculated route, and subsequent to the selection of the calculated route, the graphical display displays map information and the fuel information together, and the map information and the updated fuel information together during the navigation along the calculated route.