A loaded cargo vessel was outbound under pilotage in daylight and moderate visibility. A tug was in attendance but was released once the vessel was past the port breakwaters. About seven minutes after the tug departed the vessel, visibility unexpectedly reduced to about 200m. The vessel was at a speed of six knots, and over the next two minutes the pilot gave helm orders to make a 44 degree port turn out to sea (see diagram).
The vessel turned further to port than desired. Once the pilot...