Abstract: A navigation device and a method for calculating estimated total time requirement of navigation-planned routes with enhanced prediction accuracy includes: a map database for pre-defining calculation parameter and properties of feasible road information and traffic signs along the routes; a configuration module for entering coordinates of indication points determined as a destination where a vehicle reaches; a route planning module for receiving satellite signals of global positioning system, searching the map database for the coordinate of the indication point determined as a departure place and defined by the satellite signals received by a satellite positioning system, and planning simulated routes between the indication point determined as the departure place and the indication point as the destination place; and a process module for calculating traveling time according to properties of the feasible road information of the planned simulated routes and total stopping time according to the calculation parame