swered; but, if the first alarm signal of such vessel be not answered, she is to consider the channel clear and govern herself accordingly.

(b) When steam vessels are moved from their docks or berths, and other boats are liable to pass from any direction toward them, they shall give the same signal as in the case of vessels meeting at a bend, but immediately after clearing the berths so as to be fully in sight they shall be governed by the steering and sailing rules.

§ 93.6 Vessels running in same direction; overtaking vessel.

(a) When steam vessels are running in the same direction, and the vessel which is astern shall desire to pass on the right or starboard hand of the vessel ahead, she shall give one short blast of the steam whistle, as a signal of such desire, and if the vessel ahead answers with one blast, she shall direct her course to starboard; or if she shall desire to pass on the left or port side of the vessel ahead, she shall give two short blasts of the steam whistle as a signal of such desire, and if the vessel ahead answers with two blasts, shall direct her course to port; or if the vessel ahead does not think it safe for the vessel astern to attempt to pass at that point, she shall immediately signify the same by giving several short and rapid blasts of the steam whistle, not less than four, and under no circumstances shall the vessel astern attempt to pass the vessel ahead until such time as they have reached a point where it can be safely done, when said vessel ahead shall signify her willingness by blowing the proper signals. The vessel ahead shall in no case attempt to cross the bow or crowd upon the course of the passing vessel.

(b) Every vessel coming up with another vessel from any direction more than two points abaft her beam, that is, in such a position with reference to the vessel which she is overtaking that at night she would be unable to see either of that vessel's side lights, shall be deemed to be an overtaking vessel; and no subsequent alteration of the bearing between the two vessels shall make the overtaking vessel a crossing vessel within the meaning of the rules

in this part, or relieve her of the duty of keeping clear of the overtaken vessel until she is finally past and clear.

(c) As by day the overtaking vessel can not always know with certainty whether she is forward of or abaft this direction from the other vessel she should, if in doubt, assume that she is an overtaking vessel and keep out of the way.

§ 93.7 Vessels approaching each other at right angles or obliquely.

(a) When two steam vessels are approaching each other at right angles or obliquely so as to involve risk of collision, other than when one steam vessel is overtaking another, the steam vessel which has the other on her own port side shall hold her course and speed; and the steam vessel which has the other on her own starboard side shall keep out of the way of the other by directing her course to starboard so as to cross the stern of the other steam vessel, or, if necessary to do so, slacken her speed or stop or reverse.

(b) If from any causes the conditions covered by this situation are such as to prevent immediate compliance with each other's signals, the misunderstanding or objection shall be at once made apparent by blowing the danger signal, and both steam vessels shall be stopped and backed if necessary, until signals for passing with safety are made and understood.

§ 93.8 Meeting of steam and sailing vessels; right of way.

When a steam vessel and a sailing vessel are proceeding in such directions as to involve risk of collision, the steam vessel shall keep out of the way of the sailing vessel.

§ 93.9 Avoidance of crossing ahead.

Every steam vessel which is directed by the rules in this part to keep out of the way of another vessel shall, if the circumstances of the case admit, avoid crossing ahead of the other.

§ 93.10 Keeping to right in narrow channels.

In narrow channels every steam vessel shall, when it is safe and practi

In fog, mist, falling snow, or heavy rainstorms, whether by day or night, signals shall be given as follows:

(a) A steam vessel under way, except when towing other vessels or being towed shall sound, at intervals of not more than 1 minute, on the whistle or siren, a prolonged blast.

(b) A steam vessel when towing other vessels shall sound, at intervals of not more than 1 minute, on the whistle or siren, three blasts in succession, namely, one prolonged blast followed by two short blasts.

(c) A vessel towed may give, at intervals of not more than 1 minute, on the fog horn, a signal of three blasts in succession, namely, one prolonged blast followed by two short blasts, and she shall not give any other.

(d) A vessel when at anchor shall, at intervals of not more than 1 minute,

ring the bell rapidly for about 5 seconds.

§ 93.13 Speed in fog; pamphlet containing Pilot Rules; diagrams.

(a) Moderate speed in fog. (1) Every steam vessel shall, in a fog, mist, falling snow, or heavy rainstorms, go at a moderate speed, having careful regard to the existing circumstances and conditions.

(2) A steam vessel hearing, apparently forward of her beam, the fog signal of a vessel the position of which is not ascertained shall, so far as the circumstances of the case admit, stop her engines and then navigate with caution until danger of collision is over.

(b) Pamphlet containing Pilot Rules. All vessels and craft over 65 feet in length upon the waters described in § 93.01 shall, where practicable, carry on board and maintain for ready reference copies of the current edition of Coast Guard pamphlet CG-169. Nothing in this section shall require copies of this pamphlet to be carried on board any motorboat as defined by section 1 of the Act of April 25, 1940, as amended (54 Stat. 163; 46 U.S.C. 526).

(c) Diagrams. The following diagrams are intended to illustrate the working of the system of colored lights and pilot rules.

(c) Officers in charge, marine inspection, in districts having ferryboats shall, whenever the safety of navigation may require, designate for each line of such boats a certain light, white or colored, which will show all around the horizon, to designate and distinguish such lines from each other, which light shall be carried on a flagstaff amidships, 15 feet above the white range lights.

[Pilot rules for certain inland waters, Mar. 16, 1938, as amended at 8 FR 2600, Mar. 2, 1943; 8 FR 10764, Aug. 3, 1943. Redesignated at 13 FR 7303, Nov. 30, 1948, and amended by CGFR 54-54, 19 FR 8039, Dec. 7, 1954, and further redesignated by CGD 81-017, 46 FR 28154, May 26, 1981]

§ 93.16 Lights for barges, canal boats, scows and other nondescript vessels on certain inland waters on the Atlantic and Pacific Coasts.

(a) On the harbors, rivers, and other inland waters of the United States except the Great Lakes and their connecting and tributary waters as far east as Montreal, the Red River of the North, the Mississippi River and its tributaries above the Huey P. Long Bridge, and that part of the Atchafalaya River above its junction with the Plaquemine-Morgan City alternate waterway, and the waters described in §§ 93.16a and 93.17, barges, canal boats, scows, and other vessels of nondescript type not otherwise provided for, when being towed by steam vessels, shall carry lights as set forth in this section.

(b) Barges and canal boats towing astern of steam vessels, when towing singly, or what is known as tandem towing, shall each carry a green light on the starboard side and a red light on the port side, and a white light on the stern, except that the last vessel of such tow shall carry two lights on her stern, athwartship, horizontal to each other, not less than 5 feet apart, and not less than 4 feet above the deck house, and so placed as to show all around the horizon. A tow of one such vessel shall be lighted as the last vessel of a tow.

(c) When two or more boats are abreast, the colored lights shall be carried at the outer sides of the bows of the outside boats. Each of the outside

boats in last tier of a hawser two shall carry a white light on her stern.

(d) The white light required to be carried on stern of a barge or canal boat carrying red and green side lights except the last vessel in a tow shall be carried in a lantern so constructed that it shall show an unbroken light over an arc of the horizon of 12 points of the compass, namely, for 6 points from right aft on each side of the vessel, and shall be of such a character as to be visible on a dark night with a clear atmosphere at a distance of at least 2 miles.

(e) Barges, canal boats or scows towing alongside a steam vessel shall, if the deck, deck houses, or cargo of the barge, canal boat or scow be so high above water as to obscure the side lights of the towing steamer when being towed on the starboard side of the steamer, carry a green light upon the starboard side; and when towed on the port side of the steamer, a red light on the port side of the barge, canal boat, or scow; and if there is more than one barge, canal boat or scow abreast, the colored lights shall be displayed from the outer side of the outside barges, canal boats or scows.

(f) Barges, canal boats or scows must when being propelled by pushing ahead of a steam vessel, display a red light on the port bow and a green light on the starboard bow of the head barge, canal boat or scow, carried at a height sufficiently above the superstructure of the barge, canal boat or scow as to permit said sidelights to be visible; and if there is more than one barge, canal boat or scow abreast, the colored lights must be displayed from the outer side of the outside barges, canal boats or scows. Additionally, a flashing yellow light must be displayed at the forward end of the tow, so placed to be as nearly as practicable on the centerline of the tow.

(g)(1) The colored sidelights referred to in this section shall be fitted with inboard screens so as to prevent them from being seen across the bow, and of such character as to be visible on a dark night, with a clear atmosphere, at a distance of at least 2 miles, and so constructed as to show a uniform and unbroken light over an arc of the horizon of 10 points of the compass, and so