Breene sent out the call letters and then Bill and his observer watched for the O. K. panels. As soon as they appeared, Bill headed his plane out over the Coast Artillery radio station. Once more Breene sent out the call letters of the station. This was acknowledged by the panel signal, “understood.” Then the airplane sent down a message giving the number of the plane, the pilot’s and observer’s names and the information that they were ready to observe the fire of the guns. Each item was repeated so that the ground station would be sure to get it. Finally the ground crew placed the panels in the position which indicated “battery ready to fire.” Then Bill headed his plane out over the ocean.