33 kilometers. According to Baidu map, Yuexi County is 33 kilometers away from Erjue Police Station. Mobile phone map navigation is divided into three parts: GPS module, navigation software and GSM communication module, which cooperate with each other to complete navigation. Among them, GPS is responsible for data acquisition such as search and tracking, positioning and speed measurement; The navigation software is responsible for refreshing the electronic map and calculating the route guidance. The GSM communication module will process the collected GPS data and upload it to the designated website.