ATD stands for "Actual Time of Departure" in logistics, and it refers to the precise time at which a transportation vehicle, such as a truck, plane, or ship, departs from its point of origin and begins its journey to its destination. ATD is crucial in logistics because it allows logistics organizations and supply chain managers to watch the progress of their shipments and make necessary changes to timetables or routes. It is also used to assess carrier performance and bill consumers based on the time the goods was loaded or unloaded. Actual Time of Arrival (ATA) is the inverse of ATD, which means the exact time a vessel arrives at its destination is referred to as ATA.