1, in the navigation software, click Function-System-Settings-gps Settings-Modify the port or baud rate, which can be set in most navigation software.

2. If there is no place in your navigation software and the map is installed in the memory card of the navigator.

Read the memory card on the computer with a card reader. If it is Khalid's navigation software, you can open the NAVICONFIG.txt file to modify it. If it is other navigation software, you can also find files in txt format to find modifications.

If you still can't change it, tell me the brand of your navigator and navigation software.