How to make a Japanese travel navigation app?

The mobile phone has Google Maps, and the map can be brushed where there is wifi. For example, if you want to go to the Tokyo Tower, just enter Tkoyo Tower and Google Maps will brush out the nearby map. When you are near the Tokyo Tower, you can use Google Maps to navigate offline. .

In principle, if you are diligent enough, you can draw a map of the whole of Japan. . . .

Never use Baidu map and Gaode map in hymns. . . These two maps are not fully copyrighted. . For example, you don't need Gao De to go to North Korea. . .

Ps. Actually. . . I think the next poor travel package will do. There is a small blue map sign next to each scenic spot. You can see the scenic spot and your position by clicking on it. Just follow the direction. . . But only if. . Remember to brush out the map where there is wifi. . . . .

If you rent a car and drive by car, it is recommended to use the GPS navigation of the car rental company. . But no one will rent a car in Japan. .