"put in this waypoint"? What does it mean?

Context:

"It is important because it is more consistent (with an emergency). In other words, if the pilots had put in this waypoint that they were going to turn to and that they knew in advance of their last communication that they were going to turn, then everyone was (saying) that this had to be a premeditated act," Schiavo said. "Now if this information is correct, and it was not premeditated, then it does fit very closely with the scenario that, whatever happened, happened suddenly and they turned perhaps to go back to an emergency airport."

More:
http://edition.cnn.com/2014/03/23/world/asia/malaysia-airlines-plane/