The Williamson Turn
is a maneuver used to bring a ship or boat back to a point it previously passed through, often for the purpose of recovering a man overboard.
The Williamson Turn is most appropriate if the point can be allowed to go (or already has gone) out of sight, but is still relatively near. For other situations, an Anderson turn or a Scharnow turn might be more appropriate.
If dealing with a man overboard, always bring the vessel upwind of the person. Stop the vessel in the water with the person well forward of the propellers.