The Trinity House Jack is similar to the Master's flag, but does not have the coat of arms at the centre. An Elder Brother of the Corporation is allowed to fly the jack at the masthead of any vessel in which he is sailing. It also flies over the Trinity House at Tower Hill on flag days.
The most common Trinity House flag is the ensign. It is flown from all its pilot boats, lighthouses, lightships and support vessels.
It consists of a red background with the Union flag in the top left hand corner and the four-ship Trinity House design in the middle. This photograph shows it flying from the mast of the Leader pilot vessel on Southampton Water.
Trinity House Jack. © NMM