eta transit systems (eta) is your source for real-time fleet management systems. eta's flagship product spatial positioning on transit (Spotâ„) is an enterprise-class fleet management solution that provides automated vehicle location (avl) computer-aided dispatch (cad) and passenger information display systems (pids). spot is in use across the nation by public transit agencies and private carriers. The system is highly configurable and can be configured to support most demanding budgets and environments