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What if the car navigator doesn't have gprs positioning and the coordinates don't move?
That's because the communication port and baud rate settings of your navigation map are inconsistent with those of the navigator.

Reset.

First, you need to know the port and baud rate of your navigator, and then set the port and baud rate of the map to be the same as it.

For example, the navigation map of Kay LiDE is set as follows