When someone falls overboard what action should he skipper take?

When someone falls overboard, the skipper should immediately shout "Man overboard!" to alert the crew and keep visual contact with the person in the water. The skipper should then turn the boat around in a controlled manner, ideally using a figure-eight maneuver to return to the person's location. Deploy a flotation device if possible and ensure that crew members are ready to assist with rescue efforts. Finally, monitor the overboard individual closely while coordinating the rescue.