Step 1: Download the map software first;

Step 2: Find the files with port and baud rate (usually files with ini and txt suffixes) in the original map files on the SD card by computer, and see how many (such as port (COM): 1, BAUDRATE):4800). This file has different file names on different machines. You should read it carefully and write it down.

Step 3: Copy the downloaded map software to the SD card through the computer to replace the original map.

Step 4: Open a new mapping file, find the file with port and baud rate (usually files with ini and txt suffixes), and change it to the data just recorded (for example, port (COM): 1, BAUDRATE):4800).

Step 5: Set the default path of the map in GPS. Different brands and models of GPS have similar default path settings. One (such as Zhongheng MV770) enters System Settings-File Management -SDMMC in turn in the operating system, and finally finds the running file "*". And set this file as the default path of GPS. The other is to find the configuration file of the system (usually a file with suffix cfg and txt), and change the path name to the path name of your new map to save (I use Hengtai gps, and change the ConFig.txt file in the MobileNavigator directory, that is, change the path in ConFig.txt to a new path).

All that's left is to insert the SD card into the machine.