Patent ID: 8838378

Claim:
A vehicle navigation system comprising: an onboard vehicle navigation device; sensors for detecting and reporting vehicle speed and direction; a broadcast source of traffic information; a mobile network source of traffic information; a remotely located server having a processor and memory, the server in communication with the broadcast source of traffic information and the mobile network source of traffic information, and further including a software program adapted to compare traffic information from the broadcast source with traffic information from the mobile network source, to detect a difference therebetween, and to compare any detected difference to a predetermined difference value; and a mobile communication device in communication with the onboard vehicle navigation device and the server, the mobile communication device acting as a conduit for transmitting route guidance requests from the vehicle navigation device to the server, and for transmitting route guidance data from the server to the vehicle navigation device; wherein, upon receipt of a request for updated route guidance data from the vehicle navigation device, the server is adapted to transmit updated route guidance data to the vehicle navigation device only when a detected difference between traffic information from the broadcast source and traffic information from the mobile network source is determined to exceed the predetermined difference value.