THE INTERNATIONAL CODE OF SIGNALS 635 THE SIGNAL BOOK. The following excerpts from the Signal Book are intended to convey an idea of the layout of the Book and to provide examples for exercise as given in the Catechism, page 660. SPEED. V Z You should increase your speed to speed indicated W 0 You should proceed at your utmost speed W D You should reduce your speed to speed indicated W F Are you proceeding at full speed W F What is your present speed TOWING SIGNALS. To be used only when towing and being towed. These signals are to be made— BY DAY.—A single flag, which may be exhibited by being held in the hand or by hoisting at the stay or fore shrouds, or at 1}he gaff, according to circumstances. BY NIGHT*—By flashing> care being taken not to confuse othei ships.