Patent ID: 8280629

Claim:
A navigation device mounted in a movable body, comprising: a first storing portion configured to store a first navigation data; an acquiring portion configured to acquire a second navigation data from an external second storing portion; a movable body location detecting portion configured to detect a location of the movable body; a navigation operation executing portion configured to execute a predetermined navigation operation based on the location of the movable body detected by the movable body location detecting portion, and the first navigation data stored in the first storing portion; and an updating portion configured to update the first navigation data stored in the first storing portion with the second navigation data by executing a first updating process and a second updating process, wherein the first updating process includes stopping the execution of the navigation operation by the navigation operation executing portion, and updating a portion of the first navigation data corresponding to a first area including a vicinity of the location of the movable body detected by the movable body location detecting portion; and the second updating process is executed after the first updating process is completed and includes resuming the execution of the navigation operation by the navigation operation executing portion, and updating a portion of the first navigation data corresponding to a second area different from the first area, the second updating process executed in parallel with the navigation operation by the navigation operation executing portion.