The implementation of this specification should be fairly easy. All we need to do is set the constructor argument to the location variable:

public class Ship {
  private final Location location;
  
  public Ship(Location location) {
    this.location = location; 
  }

  public Location getLocation() {
    return location;
  } 
}

The full source can be found in the req01-location branch of the tdd-java-ch04-ship repository (https://bitbucket.org/vfarcic/tdd-java-ch04-ship/branch/req01-location).