circle to the beach. The last 1,000 yards to the beach is run at full (battle) speed. However, the control group " commander should ensure that wave one never arrives early, because of the hazards from pre-H-hour neutralization fires, the difficulty of terminating such fires early, and the necessity for beach preparation by such fires. To obtain full benefit from the grid and to track the wave's progress, wave commanders will plot their position each time the controlling station transmits it. The effects of wind and sea and/or taking incorrect headings can thus be determined and corrected. Once firm radio communications are established, grid positions can be transmitted without requiring wave commanders to receipt. However, vectors should be receipted for. If the wave commander fails to receipt for orders by radio, the primary control ship will continue to transmit “blind” and request visual acknowledgment. COMMUNICATION CIRCUITS Two nets are designated for each colored beach: channels ALFA and BRAVO. Channel ALFA is a direct net, used by the PCS to pass grid positions and boat wave directions to the BWCs and wave guide officer from the LOD until touchdown. Channel BRAVO, the beach boat operations net, is used by the PCO/PCS and ships to control assigned boats before they are dispatched to the beach. Touchdown reports and operational/administrative traffic between control ships and boats are passed on to this station. Good judgment should be used when using the net, to avoid cluttering. Voice Calls Voice calls on the control group net and beach boat operation net use daily changing call signs. The beach boat control net uses JANAP 119 call signs. Additionally, the boat group commander uses the JANAP 199 call signs on all nets to avoid confusion with wave call signs. Voice Transmissions The following are examples of voice transmis- sions: Turnover from parent ship to PCS (channel BRAVO) " ONE, THIS IS SWITCH TO CHANNEL ALFA AND  REPORT TO FOR CONTROL AND VECTOR TO THE BEACH. OVER.” Reporting it to PCS (ALFA) , THIS IS TWO BLUE ONE. REPORTING FOR CONTROL AND VECTOR TO THE BEACH. OVER.” Positive control “TWO BLUE ONE, THIS IS HOLD YOU UNDER POSITIVE RADAR CONTROL. STEER COURSE AND SPEED FOR THE LOD. SET AND DRIFT AT THE LOD IS (DIRECTION) AND (SPEED, IN KNOTS). OVER.” “TWO BLUE ONE, THIS IS . DO NOT HOLD YOU UNDER POSITIVE RADAR CONTROL. MAINTAIN PRESENT COURSE AND SPEED (POSITION). OVER.” “ONE BLUE ONE, THIS IS HOLD YOU UNDER POSITIVE RADAR CONTROL. STEER COURSE AND SPEED FOR THE LOD. SET AND DRIFT AT THE LOD IS (DIRECTION) AND (SPEED, IN KNOTS). MY INTENTION IS TO EXECUTE A LEFT ( R I G H T )  F L A N K I N G  M O V E M E N T SEAWARD OF THE LOD. OVER.” Dispatch from LOD “TWO BLUE ONE, THIS IS . YOU ARE DISPATCHED FROM THE LOD TO THE BEACH. STEER COURSE , SPEED . OVER.” LOD crossing report (control group net) , THIS IS . TWO BLUE ONE CROSSED LOD LATE ONE HALF. OVER.” Grid posits (ALFA) “TWO BLUE ONE, THIS IS . GRID POSIT ROMEO THREE EIGHT OUT.” (Wave 2 Blue 1 is right side of boat lane, 3,800 yards from the beach and on time.) TWO BLUE ONE, THIS IS GRID POSIT ROMEO THREE TWO EARLY ONE. OUT.” (Wave 2 Blue 1 is right side of boat lane, 3,200 yards from beach and is ahead of schedule 1 minute.) Vectoring waves (ALFA) “TWO BLUE ONE, THIS IS GRID POSIT ROMEO THREE ZERO EARLY ONE. VECTOR LEFT TEN. OVER.” ” TWO BLUE ONE, THIS IS GRID POSIT ROMEO, ROMEO TWO SEVEN EARLY ONE. VECTOR LEFT TWENTY. OVER.” 12-20