For those who are not familiar with the route, navigation is recommended. We can use the navigation of mobile phones. Tencent map software can be installed on mobile phones, covering offline map downloads of 400 cities across the country. After downloading the off-line map data package of the city in advance, disconnect the mobile phone network and start the zero-flow map mode in the software, so as to realize the functions of browsing the map, searching the place, planning the bus/driving route, walking navigation, driving voice navigation and so on. Basically, all the daily functions can be met, and there is zero flow in the whole process.