1. The initial password for car navigation is not uniform, and common options include 0000, 8888, 1688, 1234, 000000, 123456, and 888888. If the navigation password becomes invalid or forgotten, you can reset the navigation to default mode and set a new password by restoring the in car system.

2. Although four digit initial passwords commonly include 8880000, 1682688, and 1234, please note that some navigation initial passwords may be six digit, such as 000000 or 123456. Each car manufacturer's design may be different, so the specific initial password may vary.

3. In fact, many car navigation systems do not require a password. If a password needs to be set, the usual default options are 1234 or 0000. However, please note that the initial passwords for different car brands may vary. If you are unsure of the password or need to perform other operations, it is recommended to refer to the vehicle's user manual. In addition, most navigation devices are equipped with a reset button, which allows you to reset the factory system settings by inserting a small hole for a few seconds.