See more: Vehicle tracking system The most basic function in all fleet management systems, is the vehicle tracking component. This component is usually GPS-based, but sometimes it can be based on GLONASS or a cellular triangulation platform.[2] Once vehicle location, direction and speed are determined from the GPS components, additional tracking capabilities transmit this information to a fleet management software application. Methods for data transmission include both terrestrial and satellite. Satellite tracking communications, while more expensive, are critical if vehicle tracking is to work in remote environments without interruption. Users can see actual, real-time locations of their fleet on a map. This is often used to quickly respond on events in the field.