"As for gunners that do serve by the Sea, [they] must observe this order following. First that they do foresee that all their great Ordnannce be fast breeched, and foresee that all their geare be handsome and in a readinesse. & Furthermore that they be very circumspect about their Pouder in the time of service, and especially beware of their lint stockes & candels for feare of their Pouder, & their fireworks, & their Ducum [or priming powder], which is very daungerous, and much to be feared. Then furthermore, that you do keep your peeces as neer as you can, dry within, and also that you keep their tutch-holes cleane, without any kind of drosse falling into them." The gunners were also to know the "perfect dispart" of their pieces: that is they were to make a calculation which would enable them in sighting, to bring "the hollow of the peece," not the outer muzzle rim, "right against the marke." In the case of a breech-loader this could not be done by art, with any great exactness, "but any reasonable man (when he doth see the peece and the Chamber) may easily know what he must doe, as touching those matters." In fighting at sea, in anything like a storm, with green seas running, so that "the Shippes do both heave and set" the gunner was to choose a gun abaft the main-mast, on the lower orlop, "if the shippe may keepe the porte open," as in that part of the vessel the motion would be least apparent. "Then if you doe make a shotte at another Shippe, you must be sure to have a good helme-man, that can stirre [steer] steady, taking some marke of a Cloude that is above by the Horizon, or by the shadowe of the Sunne, or by your standing still, take some marke of the other shippe through some hole, or any such other like. Then he that giveth levell [takes aim] must observe this: first consider what disparte his piece must have, then lay the peece directly with that parte of the Shippe that he doth meane to shoote at: then if the Shippe bee under the lee side of your Shippe, shoote your peece in the comming downe of the Gayle, and the beginning of the other Ship to rise upon the Sea, as near as you can, for this cause, for when the other shippe is aloft upon the Sea, and shee under your Lee, the Gayle maketh her for to head, and then it is likest to do much good." The helmsman also was to have an eye to the enemy, to luff when she luffed, and "putte roomer," or sail large, when he saw her helmsman put the helm up. If the enemy made signs that she was about to lay the ship aboard, either by loosing more sail, or altering her course, the gunner had to remember certain things.