How to use true island induction?

Automatically used on the map in the game. In the game, I received a phone call from Nishida that "the real island is hidden in Zhongtong Street". I went to Smile Burger, where there was a huge roadblock. After investigation, I learned about "True Island Radar". Players can see the real islands nearby on the map (automatic use) and hear the call of the real islands.