| CPC G01C 21/3415 (2013.01) [G01C 21/3461 (2013.01)] | 7 Claims |

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1. A vehicle route guidance device, comprising:
a processor configured to predict a deviation point upon route guidance;
a storage configured to store data and an algorithm run by the processor; and
an output device electrically connected to the processor,
wherein the processor is further configured to:
calculate a deviation possible score using a first score according to a duplicated link between an old route before a deviation and a route after the deviation with respect to the deviation point, a second score according to road ratings of the routes before and after the deviation, and a third score according to estimated times of arrival before and after the deviation when the deviation from the route occurs during the route guidance, and
wherein the processor is further configured:
to assign a predetermined weight to each of the first score, the second score, and the third score;
to generate a deviation warning based on the deviation possible score; and
to output the old route, a deviation route and the generated deviation warning via the output device visually or audibly.
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