here, if i may. give me you are the satellite. and you are the ground station. this is the plane. join in at any point when you ve got something to add to this. the plane is flying along, and the satellite is attempting to communicate with the plane, correct? yeah, so it s using, ashleigh, continuous wave. it s a micro wave. and it s a doppler shift microwa microwave. and that allows it to ticket not just location imagine if it were a slinky and you were holding one part and richard had the other side of the slinky and you re getting closer. the slinky is bunching up. this is the diagram we ll show in a second. closer and closer, the time it takes for the information to get there gets less. it s exactly like a car, a train as it guess fast. and what he have this it they have done, they keep measuring that once an hour, as the plane has gone past.