1. To upgrade the map, you should download the map whose resolution matches the navigation. For example, if your navigation is 800*480, you have to download the map of 800*480.

2. After downloading the map, modify the port and speed of the map to make it consistent with the port and speed of navigation. For example, if your navigation is COM 1 7200, you need to download port modification software to change the map into parameters consistent with navigation.

3. The newer the map, the bigger it is, and the higher the requirements for running configuration, just like computers. For example, after downloading the latest large-scale 3D real-life map, the navigation cpu can't keep up, and it can't run after entering the login interface;

4. Navigation version, different maps need different running environments. For example, when downloading a map, indicate whether the running environment is WIN CE5.0 or 6.0. For example, if your navigation version is 5.0 and you download a map of 6.0, it is impossible to upgrade.

If you are using the D version of the map now and want to use the genuine 4G card in the future, you can still use it.

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