1. Before installing new data, it is recommended to back up all files of old data and delete old data after backup.

2. Decompress the main program first, and then copy the RtNavi folder to the map memory card.

3. Decompress the downloaded MapData package and copy the MapData and Spec folders to the RtNavi folder on the card.

4. Don't click Cancel or press the Esc key on the keyboard during the copying process, otherwise the copying will be interrupted.