BSコンパス is a tool for measuring the direction of the broadcast antenna of a mobile phone. It is designed for people who install mobile phone antennas. The measurement is made using a compass sensor of the smartphone and a magnetometer. The measurement is useful for mobile phones that use a magnetometer for navigation and location detection. It is compatible with most smartphones that have a compass sensor. The measurement is made using the latitude and longitude of the location. It is a free tool that is available for Android smartphones.