It allowed analysts to:
- Watch and record a 30-square-mile area of the city simultaneously, in real-time.
- If a crime occurred, they could "go back in time" to see where a suspect came from. Ie. track a vehicle from its destination back to its source.
- Or they could follow a vehicle "forward" in time to see where it parked, identifying potential hideouts or residences.
Of course, it was recording everyone, not just criminals.