Global Positioning Measurement (GPM) is a system that uses satellites to determine the exact location of a person or object. The system is based on the Global Positioning System (GPS), which uses a network of 24 satellites orbiting the Earth to provide precise location and time information. The system is used in many applications, such as navigation, surveying, and tracking. The term LAT refers to the latitude coordinate of a location, which is one of the two coordinates used to pinpoint a location on the Earth's surface.