That's right. We pointed his location using GPS. You see, initially he was sending a transmission that was in morse code, that we happened to pick up when we first boosted our transmission tower. We obviously don't have satellites but whatever it is sent us a continuous stream of 'why'

[ Senku, was Ichigo even asking for all of this detail? Probably not. ]

So when I attempted to engage, the transmission stopped and it was radio silence until after we finished on treasure island, then we got a synthetic voice back interrupting our connection to the mainland and he was trying to give the command to turn us all to stone again. We pinpointed the transmission with an improvised parabolic antenna, and hooked that into our sonar system so we could track the movement of the signal and it corresponded with the movement of the moon.