The spreading tank is equipped with a digital display with 2 different counters: number of capsule requested and number of capsules actually dropped. The correspondence between the 2 counters allow controlling that the capsules were effectively released or not (empty tank). The spreading tank is also equipped with LEDs for easy remote visual control (the LED lights up at each bead release).
If you have chosen to connect the feedback system, you will get the drop information directly from your ground station.