What does it mean when the starting city has no offline data?

[DiHannah]

When the starting city has no offline data, it means the navigation data needs to be updated. The navigation system does not have the offline map package for this city. First, check if it's a network issue, then verify if there's any signal interference, and finally, see if the starting city has the relevant data. Internal structure of a car navigation system: It integrates a GPS antenna and receiver, automatically calculates and displays positioning results without requiring an internet connection. However, if the positioning data needs to be transmitted to remote devices, a GPRS module is usually integrated to facilitate data transmission over the public network. Functions of a car navigation system: The car navigation system features GPS global satellite positioning, automatic voice navigation, optimal route search, and more. It allows drivers to know their exact location at any time while driving and helps them take the shortest route, ensuring a smooth journey.