After stating the case, delivered the opinion of the court.
We are of opinion that the writ of error was providently allowed, and that the jurisdiction of this court is clearly maintainable.
Plaintiff in error expressly claimed the right under the statutes of the United States to navigate the Yosemite on the Hudson with- a masthead light and side lights in accordance *691with the statutory rules on that subject, and- also the right in such navigation to the explication of those rules in certain other particulars; and if these rights were denied, or either of them, -the jurisdiction attached for the determination of the questions thus raised. It is of vital importance that these rules should be interpreted and enforced by. the state courts in the same sensó that they are in the courts of the United States. This action was for a maritime tort committed upon navigable waters and within the admiralty jurisdiction, and the appellate jurisdiction of this court over questions national-and international in their nature .cannot be restrained by the mere fact that the party plaintiff has elected to pursue' his common law remedy in a state court. • ■ - ■
The doctrine in admiralty of an equal division of damages in the case of a collision between two vessels when both are in fault contributing to the collision, hás long prevailed in England and this country. The Max Morris, 137 U. S. 1. But at common law the general rule is that if both vessels are culpable in respect of faults operating directly and immediately to produce the collision, neither can recover damages. for injuries so caused. Atlee v. Packet Co., 21 Wall. 389.
In order to maintain his action, the plaintiff was obliged to establish the negligence of the defendant, and that' such negligence was the sole cause of the injury, or, in other words, he could not recover, though defendant were negligent, if it-appeared that his own negligence directly contributed to the result complained of.
(1) The particular fault imputed to the Yosemite was that she did not carry the range lights prescribed by Buie seven of the Buies of Navigation enacted by section 4233 of the Bevised •Statutes, and, this fact being admitted, it was ruled,-as matter of law. that she was therefore guilty of negligence. The correctness of this ruling depends on whether, upon the true construction and application of those rules, the Yosemite Came within Buie seven.
Under Buie two, the lights prescribed by the rules, and no others, are required to be carried in all weathers, between sunset and sunrise.
*692By Buie three, “all ocean-going steamers, and steamers carrying sail, shall, when under way, carry,” at the foremast head, a bright white light; on the starboard side, a green light; on the port side, a red light; all as described.
By Bale four “ steam-vessels, when towing other vessels, shall carry two bright -white masthead lights vertically, in •addition to their side lights,” of the same character and construction as the masthead lights prescribed by Buie three.
Buie five provided: “All steam-vessels, other than oceangoing steamers and steamers carrying sail, shall, when under way, carry on the starboard and port sides lights of the same character and construction, and in the same position as are prescribed for side lights by Buie three, except in the case provided in Buie six.”
Bule sjx related to “ river steamers navigating waters flow-' ing into the Gulf of Mexico and .their tributaries,” and provided that they should carry the red and green lights on their starboard and port smoke pipes instead of on their sides.
By Buie eight, sail-vessels, when under way, or being towed, must carry the same lights as steam-vessels under way, but not the white-masthead lights.
By Buie nine, vessels too small to have the green and red lights fixed upon their starboard and port sides shall have them ready “ for instant exhibition.”
Buie seven read: “ All coasting steam-vessels, and steam-vessels other than ferry-boats, and vessels otherwise expressly provided for, navigating the bays, lakes, rivers, or other inland waters of the United States, except those mentioned in Buie six, shall carry the red and green lights as prescribed for oceangoing steamers; and in addition thereto a central range of two white lights; the after light being carried at an elevation of at least fifteen feet above the light at the head of the vessel.' The headlight shall.be so constructed as to show a good light through twenty points of the compass, namely: from right ahead to two points abaft the beam on either side of the vessel; and the after light so as to show all around the horizon. The lights for ferry-boats shall be regulated by such rules as the board of supervising inspectors of steam-vessels shall prescribe.”
*693The manifest object of this rule was the requisition of the range lights; but, out of abundant caution, and notwithstanding the provisions of-Rule five, the mandate as to the red and green lights is repeated, and the range lights declared to be “ in addition.”
The importance attributed to the red and green lights is apparent throughout these rules and in the rules and regulations of the board of supervising inspectors. After diagrams are given in illustration of the working of the system of such lights, it is there said that by reference to them “it will appear evident that in any situation in which two vessels may approach each other in the dark, the colored lights will instantly indicate to both the relative course of each; that is, each will know whether the other is approaching directly or crossing the bowrs, either to starboard or port. This intimation, with the signals by whistle, as provided, is all that is required to enable vessels to pass each other in the darkest night with almost equal safety as in broad day.”
Rule seven applied to coasting steam-vessels, and steam-vessels, other than ferry-boats and other than vessels otherwise expressly provided for, navigating inland -waters, and excepting the river steamers mentioned in Rule six.
Steam-vessels not otherwise expressly provided for were those not expressly provided for in the matter of lights other than the red and green lights. Ocean-going steamers • and steamers carrying sail and steam-vessels when towing other vessels were thus otherwise expressly provided, for in Rules three and four. Rule five related- wholly to the red and green lights, and did not expressly provide for other lights. Mississippi steamers were expressly excepted from the operation of Rule five, because, although they also carried red and green lights, these lights occupied a different position than in the-instance of other steam-vessels; and Mississippi steamers were also expressly excepted from the operation of Rule seven, because under these rules they were to carry only red and green lights, and were, therefore, not otherwise expressly provided for-in respect of lights other than the red and green lights. The rules were accurately- drawn, and should nót be *694deprived of their obvious application by refined construction.
To repeat: Ferry-boat lights were to be regulated.by the board of supervising inspectors; all steam-vessels were to carry red and green lights, but differently placed on river steamers navigating the waters flowing into the Gulf of Mexico; coasting steam-vessels and steam-vessels engaged in inland navigation were governed by Eule seven ; and vessels otherwise expressly provided for by the provisions thus made. And it was expressly provided that, in addition to .the green and red lights, steam-vessels when towing other vessels should carry two bright white masthead lights vertically,'and ocean-going steamers and steamers carrying sail should carry, when under way, at the foremast head, a bright white light, and no others.
It may be added that range lights were originally required by the statute of New York of 18-26. Laws N. Y. 1826, c. 222, p. 253. Side-lights were not then provided for, and there were practically no ocean-going steamers.. When colored lights were introduced' and changed conditions obtained, new rules became necessary and were adopted. -
As to ocean-going steamers and steamers carrying sail, the bright white light required, at' the foremast head was to be “ so constructed as to show a uniform and unbroken light over an arc of the horizon of twenty points of the compass,” while as to coasting steamers, of the centra! range of two white' lights prescribed, the after light was to be “ at least fifteen feet above the light at the head of the vessel,” and ££ to show all around the horizon.”
The argument that by reason of the difference between the two classes, the lights required as to one class would be im- - •practicable in respect of the other, is not without force, and indeed, on April 9,1887, the Secretary of the Treasury approved the conclusion of the Supervising Inspector-General, that ,££ the central range lights provided in Eule seven, Section-4333, Eevised Statutes, are never to be used on ocean steamers, as the.white light aft required by that rule would be obscured by the masts, yards, and- rigging of such a steamer, and therefore useless.” ' Treas. Dec. 1887, p. 200, No. 8168.
*695The Yosemite was an “ocean-going steamer.” She was constructed for and adapted to ocean navigation, had been upon the ocean, and had just been authorized “ to navigate for one year the waters of any ocean route.” She was also a “ steamer carrying sail.” She ' was none the less “ oceangoing” because not at the time on the ocean, and none tlm less “carrying sail” because she was not at the time under sail. These terms were merely descriptive of her characteristics, and not of her situation. She was “under way,” which words, in Rule three, would be superfluous if she must be traversing the ocean in order to be “ ocean-going,” and have her sails set in order to be “carrying sail;” and she was “under steam” and therefore not governed by the rules applicable to a steamer solely “under sail,” by Rule one, a rule demonstrating that “under sail” and.“carrying sail” were not used as synonymous terms.
In our judgment, the lights she was required to carry were expressly provided for in Rule three, and these lights she had.
The decision of the Court of Appeals that the Yosemite was bound to carry “a central range of two white lights,” as prescribed in Rule seven, was based upon the ground that she was “in legal character and by nomenclature ‘a coasting steam-véssel; ’ ” and that, even if this might “ not be absolutely true of the Yosemite in all situatións, it was nevertheless true of her when navigating inland waters.”
By the first section of the act of Congress of August 7,1848, 9 Stat. 274, c. 141, the Secretary of the Treasury was authorized to cause yachts used and employed exclusively as vessels of pleasure, to be enrolled and licensed as vessels which were not required to qualify at the custom house; and this act was ' amended by that of June 29, 1870, 16 Stat. 170, c. 170, by inserting after the words “port to port of the United States” the words “ and by sea to foreign ports,” and as thus amended was carried forward into section 4214 of the Revised Statutes.
The Court of Appeals was of opinion that yachts licensed under the statute of 1848 were exclusively coasting vessels, and that, as by the act of 1870, the}7 might be permitted to *696proceed by sea to foreign ports, they thus might have a double character, that is, of coasting vessels and vessels entitled to go upon the. seas to foreign ports. Reference was made to the fact that the Yosemite was enrolled at the port of New York ' in conformity to Title Fifty of the Revised Statutes, entitled “Regulation of Vessels in Domestic Commerce,” and was also licensed in pursuance of chapter two, Title Forty-eight, entitled “Regulations of Commerce and Navigation.” And it was said that Title Fifty related exclusively to coasting and fishing vessels, while Title Forty-nine was entitled “Regulations of Vessels in Foreign Commerce.” The conclusion was then announced that the Yosemite, being enrolled under the statute relating to coasting vessels, and her license being a coasting license, with the added privilege of being allowed to proceed to'foreign ports, it did not seem to allow, of reasonable doubt •that the Yosemite while navigating the Hudson River was navigating under her license in the character of a coasting vessel.
We are unable to accept this conclusion. While Title Fifty is entitled by way of convenience “Regulation of Vessels in Domestic Commerce,” there are many provisions contained under that title relating to vessels engaged in foreign commerce, and among them sections 4322 and 4323; which enable the owner of a coasting vessel to surrender his enrolment and register his vessel, or to surrender his register and take out an enrolment.
The register declares the nationality of a vessel engaged in foreign tradé, the enrolment, the national character of a vessel engaged in the home traffic and enables her to procure a coasting license. By section 4318, under the same title, vessels navigating the waters of the northern, northeastern, and northwestern frontiers, otherwise than by sea, may be enrolled and licensed in such form as other véssels, and need not take out a certificate of registry. The Mohawk, 3 Wall. 566.
Ordinarily the terms “coaster” and “coasting vessel” are ' applied to vessels plying exclusively between domestic ports, and usually to those engaged in domestic trade as distinguished from vessels engaged in the foreign trade or plying between a *697port of the United States and a port of a foreign country. Gibbons v. Ogden, 9 Wheat. 1.
The- mere fact that an ocean-going steamer may touch at some other port of the United States, after leaving her port of departure, would not make- her a coaster, and this is recognized by section 4337, which is another of the sections included' in Title Fifty worthy of notice.
Pleasure-yachts, designed as modeU of naval architecture, are not coasters in any statutory seise, for they are not allowed to transport merchandise or carry passengers for pay, and we do not think it reasonable to construe the words of the statute applicable to coasters as applicable' to them in view of their character and the .legislation upon the subject taken together.
As we have remarked, vessels engaged in domestic commerce may be transferred to the class of vessels authorized to sail to foreign ports by a change from an enrolment to a register ; but, in the Case of yachts, the statute provides that when entitled to be enrolled as American vessels, they may be authorized to proceed from port to port of the United States, and also by sea to foreign ports, so that, by a simple license, being mere pleasure-boats, not authorized to transact business, they may sail to either, but their essential character as oceangoing steamers, if they are such, remains the same, whether they are actually, navigating from port to port of this country or to ports abroad.
The Yosemite was enrolled in 1881, and in May, 1882, took out the license which authorized her to proceed by sea to foreign ports and also from port to port in the United States. The privilege of doing both was granted, and her license np more authorized her to proceed to domestic ports, with the added privilege of going to foreign ports, than to proceed to foreign ports with the added . privilege of navigating between domestic ports. She could do both, and to enable yachts to do so was the design and express language of the statute.
We have not deemed it necessary to discuss the supposed bearing of the act of February 28, 1871, 16 Stat. 440, 454, c. *698100, referred to by defendant in error, or the acts of 1861, 13 Stat. 58, c. 69, and of 1866,' 11 Stat. 227, e. 231, as substantially the same question- would arise under those acts, and the obscurity, if any, is not in the revised law.
Nor have we felt called-upon to refer to the acts of March 3, 1885, 23 Stat. 138, c. 354, or that of August 19, 1890, 20 Stat. 320, c. 802, as this collision occurred in 1882.
"We hold that Nule seven was not applicable to the Yosemite, and that therefore the Court of Appeals erred in affirming the judgment of the Supreme Court, .which approved the instruction of the learned trial judge, (to which exception Ayas duly saved,) that “the Yosémite, upon that occasion, Avas bound to have those, lights which I have described to you as central range lights, and the absence of those statutory signals Avas, upon her part, negligence.”
(2) In addition to the rules for preventing collisions, prescribed by section-1233, it was provided by section 1112 that “ the board of • supervising inspectors shall establish such regulations to be observed by all steam-vessels. in passing each other, as they shall from time to time déem necessary for safety.” The rules laid down by the latter as thus authorized have the force of statutory enactment, and their construction, (when put in evidence as they were in this case,) as Avell as that of the rules under section 1233, is for the court, whose duty it is to apply them as matter of law upon the , facts of a given case. They are not mere prudential regulations, but binding enactments, obligatory from the time that the necessity for precaution begins, and continuing so long' as the means and opportunity .to avoid the danger remains. The Dexter, 23 Wall. 69. Obviously they must be rigorously enforced in order to attain t.he object for Avhich they were framed, which could not be secured if the masters of ATessels were permitted to indulge their discretion in respect of obeying or departing from- them. Nevertheless it is true that there may be extreme cases where departure from their requirements is rendered necessary to avoid impending peril, but only to the extent-that such danger demands. The John L. Hasbrouck, 93 U. S. 105 ; The Sunnyside, 91 U. S. 208; The *699Johnson, 9 Wall. 146; The City of Washington, 92 U. S. 31; The Voorwarts & Khedive, 5 App. Cas. 876; The Byfoged Christensen, 4 App. Cas. 669.
And while under Buie twenty-four, in construing and obeying the rales, due regard must be had to all dangers of navigation and to any special circumstances which may exist in any particular case, rendering a departure from them nécessary in order to avoid immediate danger, the burden of proof lies on the party alleging that he was justified in such departure. The Agra, L. R. 1 P. C. 501; The General Lee, Irish L. R. 3 Eq. 155. Indeed, in The Agra, it was ruled that not only must it be shown that the departure at the time it took place was necessary in order to avoid immediate danger, but also that the course adopted was reasonably calculated to avoid that danger. And it is the settled rule in this court that when a vessel has committed a positive breach of statute, she must show not only that probably her fault did not contribute to the disaster, but that it could not have done so. The Pennsylvania, 19 Wall. 125, 136; Richelieu Navigation Co. v. Boston Ins. Co., 136 U. S. 408, 422.
Obedience to the rules is not a fault even if a different course would have prevented the collision, and the necessity must be clear and the emergency sudden and alarming before the-act of disobedience can be excused. Masters are bound to obey the rules and entitled to rely on the assumption that they will be obeyed, and should not be encouraged to treat the exceptions as subjects of solicitude rather than the rules. The Oregon, 18 How. 570.
By Buie nineteen, “ if two vessels under steam are crossing so as to involve risk of collision, the vessel which has the other on her own starboard side shall keep out of the way of the other.”
By the eighteenth, if two vessels under steam are meeting end on or nearly end on, so as to involve risk of collision, the helms of both must be put to port so that each may pass on the port side of the other.
This is repeated in Bule 1 of the inspectors’ rules, and it is provided not only that when steamers are thus approaching *700each other, it shall be the duty of each to pass to the right, or port side of the other, but that the pilot of either may be first ■ in determining to pursue this course, and thereupon shall give as a signal of his intention one short and distinct blast .of his whistle, which the pilot of the other vessel shaft answer by a similar blast, and thereupon said steamers shall pass to the {port side of each other.
By Eule 2, when steamers are approaching each other in an oblique direction, (as shown in fourth situation,) they shall pass to the right of each other as if meeting “ head and head,” or nearly so, and the signals by whistles shall be given and answered promptly as in that case specified.
By Eule 3, if, when steamers are approaching each other, the .pilot of either vessel fails to understand the course or intention of the other, whether from signals being given or answered erroneously, or fi’om other causes, the pilot, if in doubt, shall immed iately signify the same by giving several short and rapid blasts of the steam whistle, -and if the vessels shall have approached within half a mile of each other, both shall be immediately slowed until the proper signals are given, answered, or understood, and until the vessels shall have passed.
It seems to us that these rules were strictly applicable, and were disregarded by the Yanderbilt. When the plaintiff rested, the defendant moved to 'dismiss, which was overruled, and it is contended here that on the plaintiff’s own showing the Yanderbilt was palpably guilty of negligence which contributed directly to produce the collision, and hence that that motion should have been sustained; but we do not care to •pass upon that question, and content ourselves with indicating certain errors in the rulings Of the trial court, which appear to us to so essentially deprive the rules of the force which should have been given them as to amount to a decision against rights claimed under the statute of the United States. The speed of the Yosemite was about sixteen miles, and that of the Yanderbiít nine miles, an hour,- and they Avere approaching each other, therefore, at an aggregate speed of twenty-five miles an hour. The pilot of the Yanderbilt testified that he saw the white light of the Yosemite when he was between the ice-houses, *701apparently a mile distant. The steamers were then on parallel courses. He did not see her green light at any time, but saw her red light just before or just after she blew two whistles. 'When he was abreast of the lower ice-house, he thought about a quarter of a mile from the place of collision, he headed her for Dinsmore’s house, “ way off to the eastward,” and, believing that the Yosemite was a tow, laid his course more to the eastward. He was thus crossing the course of the Yosemite, which was brought on the starboard. At this point the pilot of the Yosemite gave a short and distinct blast from his whistle as required by law, as a signal of his intention to pass to the port side of the Yanderbilt, and this the pilot of the Yanderbilt answered by' a similar blast; whereupon under the rules it became imperative for the steamers to pass to the port side of each other. The Yanderbilt was bound to go to the right after the bargain was made by the exchange of single whistles; but instead of doing this, and immediately after, the Yanderbilt’s pilot gave two whistles, which it is claimed on behalf of the plaintiff were answered by two whistles from the yacht. This is denied by the latter; and even if true, an assent to the Yanderbilt’s change was at the latter’s risk. The Yanderbilt’s pilot on the instant sheered his boat to port, then slowed, and the collision occurred, the Yanderbilt being struck nearly at riglitangles.
Among other instructions the court was requested by the defendant below to give, were these :
“ 8. As the proof is undisputed that the steamboat Yanderbilt and the yacht Yosemite were approaching each other head and head, or nearly so, the law prescribes their duties respectively in regard to blowing their whistles.
“ 9. If the yacht Yosemite, as the'vessels were approaching each other, blew a single whistle and the steamboat Yanderbilt answered it by a single whistle, the course which she was thereupon bound to pursue was thereupon determined and each-vessel was bound to pass to its own right, that is, to the port side of each other, which would have been the Yanderbilt to the west and the yacht Yosemite to the east.
“10. The pilot who first blew the'first whistle thereby had *702the right to and did determine the course which each was then to adopt.
“ 11. The blowing of the single whistle by the steamboat Yanderbilt after the first single whistle from, the yacht Yosemite was an acceptance by the steamboat Yanderbilt of the ’ election of the course so adopted by the yacht Yosemite, and it then became the duty of the steamboat Yanderbilt to pass to the port or western side of the Yosemite.”
“ 14. Even if the Yanderbilt, after having by one whistle accepted the one whistle of the yacht, had a right to change the conditions and course by a blast of two whistles, yet unless these two whistles were given in time to enable the yacht to go in safety to the west of the Yanderbilt, they would tend to complicate the situation, and the Yanderbilt was in that event guilty of negligence in giving the signal of two whistles.”
These instructions were refused and the defendant excepted.
The court instructed the jury on this branch of the case that it was claimed on the part of the defendant that it was negligence for the Yanderbilt to blow the two whistles and to take the rank sheer and cross the bow of the Yosemite, and on the part of the plaintiff that at the time of the two signals being given it was impracticable to carry out the agreement which had been made by the signal which had been given and accepted of the one whistle; that he was compelled to give the two signals, and believed the Yosemite accepted his ' proposition that each should go to the left, while on the part of the defendant it was contended that two whistles were not blown in response,- but that the pilot of the Yosemite started to blow three as a signal of danger and of repudiátion of the offer made by the Yanderbilt, but befoi’e he could get them out the collision occurred ; and the court left it to the jury to say whether the pilot of the Yanderbilt in attempting to change his course and to cross the bows of the Yosemite was guilty of negligence which contributed to the accident. Rule 3 was treated by the court in a similar way.
In short, the learned judge instructed the jury that it was for them to determine whether those who were in the management of the respective boats w.ere guilty’- of negligence or *703not, and. whether or not they did or omitted to do that which persons of ordinary care and prudence ought to have done; but in charging in this general way, and refusing to give the instructions above named, the obligatory force of the rules of navigation was substantially ignored.
The question whether, upon the proofs, the departure by the Vanderbilt from the rules was justified was not put to the jury, but whether upon the whole there was negligence in what was done or left undone. In this, there was such error as the defendant may avail himself of in this court, so far as saved by his requests to charge.-
If these two steamers were approaching each other head and head, or nearly so, or obliquely,-as; mentioned in Rule two, the law-prescribed their duties respectively, and the jury should have been told so; and as there was no doubt that upon the exchange of single whistles the course each was bound to pursue was determined, the instructions to that effect should have been given. And so, if the Yosemite assented to the two whistles and the Vanderbilt’s course, this, if an error, was one at the risk of the Vanderbilt, and at most would be an error in which both concurred, and if both were in fault, there could be no recovery. Of course, the test as to whether the departure from the rules was excusable, if there were clear and satisfactory evidence to that effect, might have been applied through proper instructions or qualifications on that subject, but as the case stood, we think those above quoted should have been-given, and that the refusal to do so, taken with the actual instructions, erroneously disposed of a Federal right.
The judgment of the Court of Appeals is reversed and the cause is remanded for further proceedings not inconsistent with this opinion.