Robert D. Blair, Charles L. Moore, Jr., and William G. Dodds, Jr. were convicted of traveling in interstate commerce with the intent to further unlawful activity, possessing and conspiring to possess marijuana with the intent to distribute, importing and conspiring to import marijuana, and aiding and abetting, in violation of 18 U.S.C. § 1952, 21 U.S.C. §§ 841(a)(1), 846, 952, and 963, and 18 U.S.C. § 2. The district court sentenced all three defendants to five years on each count, the sentences to run concurrently. The defendants assign as error the district court’s denial of their motion to suppress evidence of the marijuana. Additionally, Blair charges that the district court abused its discretion and denied him due process in sentencing him. We affirm the defendants’ convictions and the sentence imposed upon Blair.
I. Background
In the early morning hours of April 29, 1979, Sergeant Hutchinson and another officer of the Charles County, Maryland, sheriff’s department arrived at Smith Point on the Potomac River, an area previously used as a drop-off for smuggled drugs, to check into a report that suspicious looking vehicles had been spotted there. They discovered a parked truck, a van, what appeared to be marijuana residue in the van, CB equipment, diesel fuel, a generator, a vacuum cleaner, a tarp, a handtruck, an extension cord, a lamp, a locked trunk, wire, and indentations in the sand apparently made by people running, all of which led them to initiate a drug investigation.
As it grew light, the officers noticed a thirty-one foot sailboat off shore, and, after observing a crew member tossing something overboard, they had the sheriff’s department instruct the Maryland marine police to board the vessel in connection with the drug investigation underway. The seizure and search of that vessel — not challenged here — turned up no contraband.
Customs officer Bass, who had been advised to contact the sheriff’s department about the investigation and was therefore *503present at the boat, along with customs officer Jungerfeld, then received a call from a previously reliable informant regarding another suspect vessel. The informant, who knew of the suspicious vehicles found earlier that day at Smith Point, claimed to have seen a three masted, fifty to sixty foot sailboat with five persons on board and riding low in the water, in the area near Smith Point. The customs officers, accompanied by Maryland marine police officers Sciukas and Furey and by Sergeant Hutchinson, set out on the Potomac in a Boston Whaler owned by the marine police to intercept the vessel.
Although aided by a state police helicopter, the officers did not discover any three masted boats. The helicopter patrol, however, had spotted two two masted sailboats, one thirty to forty feet long and the other a fifty foot Morgan. After receiving word that the informant upon reconsideration thought that the boat he saw might have only been two masted and that it was white with a black stripe and had a dinghy in tow, the officers decided to “check out” both vessels.
The officers first motored over to the smaller boat, only to learn that a family known to one of them was aboard. They then headed for the fifty foot Morgan, and, after observing that it appeared to be heavily loaded and after checking the area for other boats of similar description and finding none, they approached it. Their observations were that the boat, named the CENTAURUS, was riding low in the water, that it was white and had two masts and three sails and was towing a dinghy, that the vessel’s letters were not properly displayed, and that there appeared to be three men on board.
As the officers’ Whaler closed in upon the sailboat, Sergeant Hutchinson stood in the front, holding a shotgun, and, when the Whaler pulled alongside the CENTAURUS, one of the individuals on boárd raised his hands and exclaimed, “Don’t shoot; we are unarmed; we don’t have any guns; you have got us.”
Sergeant Sciukas immediately started to climb onto the CENTAURUS, and, as he stood on the edge of the Whaler in preparation for boarding with his head and shoulders above the cockpit of the CENTAURUS, he smelled “a very heavy odor of marijuana.” When he stepped into the CENTAURUS’ cockpit, he could see what he described as bales inside two open hatches. Customs officer Jungerfeld then boarded it, and he too smelled the aroma of marijuana and saw burlap covered bales. Customs officer Bass upon boarding spotted marijuana residue scattered on top of some of the bales and also saw what appeared to be marijuana in a small open container in the galley area. Sergeant Hutchinson then arrested the crew of three, Blair, Moore, and Dodds; customs officer Bass requested the boat’s documentation in order to determine if the boat was involved in smuggling; and the boat was searched for other individuals.
The CENTAURUS was taken to the Naval Ordinance Station at Indian Head, Maryland, where it was kept until the next day, when the marijuana was unloaded. The marijuana had been packaged in cardboard boxes, some of which had also been wrapped in burlap and secured by tape. Either prior to or during the unloading, however, some of the packages had split and broken open, revealing their contents. After the unloading had been completed, Drug Enforcement Administration (DEA) agents, without having secured a warrant, opened some of the packages for sampling purposes.
Subsequent to their indictment, the defendants moved to suppress the evidence of the marijuana as well as film found aboard the CENTAURUS. After conducting an evidentiary hearing, the magistrate recommended denial of the motion to suppress the evidence except for the film. Upon review of the magistrate’s findings and conclusions, the district court denied the motion in total, and the defendants were subsequently convicted and sentenced.
*504II. Suppression of the Marijuana
On appeal the defendants strenuously argue that the marijuana1 should have been suppressed on two grounds: (1) that the seizure and search of the CENTAURUS was unlawful, and (2) that the opening of the boxes of marijuana after the CENTAURUS had been unloaded constituted an illegal search. We explore in turn each of these grounds for suppression.
A. Seizure and Search of the CENTAURUS
The government contends that the seizure and boarding of the CENTAURUS were lawful upon a theory either that the customs officers and marine police had statutory authority to stop and board a vessel, or that the seizure and boarding were reasonable, and hence constitutional, under the fourth amendment. The subsequent search of the CENTAURUS was legal, it asserts, because Sergeant Sciukas’ recognition of the pungent odor of marijuana while climbing on board the CENTAURUS supplied probable cause for the search and because the mobility of the vessel created exigent cii’cumstances excusing the acquisition of a warrant. We find lawful the initial stop of the CENTAURUS and agree that the war-rantless search was legal because the officers had probable cause and faced exigent circumstances at the time it occurred.
The justification for the seizure and search of the CENTAURUS lies in both the statutory powers of the customs officers and state marine police and the reasonableness of the seizure and search under the fourth amendment. These sources of authority are not separate, however, as the government would seem to suggest, but are instead interrelated. The applicable statutes vested the officers with the authority to stop and search the boat. The fourth amendment’s requirement of reasonableness, however, limited their statutory authority in these circumstances to that of making a brief investigatory stop upon a reasonable suspicion of illegal activity and searching the boat only upon probable cause.
The statutory authority of customs officers to stop, board, and search a vessel is found in 19 U.S.C. § 1581(a), which reads in pertinent part:
Any officer of the customs may at any time go on board of any vessel ... at any place in the United States or within the customs waters . .. and examine the manifest and other documents and papers and examine, inspect, and search the vessel ... and every part thereof and any person, trunk, package, or cargo on board, and to this end may hail and stop such vessel . . . and use all necessary force to compel compliance.
Maryland marine police officers’ statutory authority to stop, board, and search a vessel is similarly broad; Md.Nat.Res.Code Ann. § 8-727 (1974) reads: *505By their terms, these statutes appear to grant customs officers and the Maryland marine police and other state law enforcement officers unfettered authority to stop and search a vessel. The statutory language must be read, however, in light of the fourth amendment’s requirement that seizures and searches be reasonable,3 for no statute can authorize a violation of the Constitution. See Almeida-Sanchez v. United States, 413 U.S. 266, 272, 93 S.Ct. 2535, 2539, 37 L.Ed.2d 596 (1973).
*504A natural resources police officer or any law enforcement officer enforcing the provisions of this subtitle [the State Boat Act] may stop, board, or inspect any vessel subject to this subtitle.2
*505The initial question before us is whether the stop of the CENTAURUS was a reasonable seizure under the fourth amendment. The requirements that the fourth amendment’s reasonableness standard imposes upon a vessel seizure vary greatly according to that vessel’s geographic location. A coast guard stop of a vessel on the high seas under 14 U.S.C. § 89(a), for instance, is the equivalent of a border stop ■and therefore is reasonable even absent any suspicion of criminal activity on board. See United States v. Harper, 617 F.2d 35 (4th Cir.), cert. denied, 449 U.S. 887, 101 S.Ct. 243, 66 L.Ed.2d 113 (1980). The seizure of a vessel by customs officers or the coast guard in customs waters, including the territorial waters running from the coast to the three mile border at sea, may also be reasonable as a border stop requiring no probable cause, if the vessel came from international waters and crossed the territorial border. See, e. g., United States v. Laughman, 618 F.2d 1067, 1072 n.2 (4th Cir.), cert. denied, 447 U.S. 925, 100 S.Ct. 3018, 65 L.Ed.2d 1117 (1980) (dictim); United States v. Tilton, 534 F.2d 1363 (9th Cir. 1976).
Our case, however, concerns the seizure of a vessel on inland waters, the Potomac River, with no allegation that the vessel crossed an international border. Under these circumstances, we conclude in accordance with the district court that the fourth amendment requires the customs officers and state police to have had at least a reasonable suspicion that the CENTAURUS was engaged in illegal activity and to have limited the seizure to a brief investigatory stop. This is the prevailing standard of reasonableness under the fourth amendment with respect to a vessel seizure in inland waters, made without sufficient evidence of a border crossing. See United States v. D’Antignac, 628 F.2d 428 (5th Cir. 1980), cert. denied, 450 U.S. 967, 101 S.Ct. 1485, 67 L.Ed.2d 617 (1981); United States v. Zurosky, 614 F.2d 779 (1st Cir. 1979), cert. denied, 446 U.S. 967, 100 S.Ct. 2945, 64 L.Ed.2d 826 (1980); United States v. Odneal, 565 F.2d 598 (9th Cir. 1977), cert. denied, 435 U.S. 952, 98 S.Ct. 1581, 55 L.Ed.2d 803 (1978).
The officers on board the marine police Whaler clearly had a reasonable suspicion that the CENTAURUS was engaged in smuggling marijuana: the evidence of a smuggling operation underway at Smith Point, the sighting by a reliable informant of a sailboat riding low in the water, and the discovery of a heavily laden sailboat of similar description, were, as the district court found, objective and articulable facts creating a reasonable suspicion of illegality which justified a brief investigatory stop.
The defendants do not protest that the officers had a reasonable suspicion sufficient to support the stop. They do, however, argue that an investigatory vessel stop does not include a boarding and that, by commencing to board the CENTAURUS without probable cause to support a search, Sergeant Sciukas exceeded the limits of the stop. We are persuaded that a boarding is a necessary element of many vessel investigatory stops, given the sound and motion of water, the often significant size differential *506between the government’s boat and the investigated vessel, and the extreme mobility of water craft. At least two other circuits have concluded that an investigatory stop of a vessel permits a boarding. See United States v. D’Antignac, 628 F.2d 428 (5th Cir. 1980), cert. denied, 450 U.S. 967, 101 S.Ct. 1485, 67 L.Ed.2d 617 (1981); United States v. Zurosky, 614 F.2d 779 (1st Cir. 1979), cert. denied, 446 U.S. 967, 100 S.Ct. 2945, 64 L.Ed.2d 826 (1980). We caution that license to board a vessel during an investigatory stop, however, is not license to wander all over the boat or to search for evidence of illegality: the boarding is a part of a brief investigation and the investigating officers’ actions must be limited accordingly. A boarding, nevertheless, can be an appropriate part of an investigatory stop, and we hold that in this case it was. Sergeant Sciukas was therefore still acting within the confines of a brief investigatory stop when he started to board the CENTAURUS.
While he was in the process of boarding, Sergeant Sciukas smelled the odor of marijuana. The smell supplied probable cause for the state officers and customs officials to act upon their statutory authority and conduct a search of the boat. See, e. g., United States v. Rivera, 595 F.2d 1095, 1099 (5th Cir. 1979). The officers then undertook a warrantless search of the CENTAURUS, the exigent circumstances arising out of the boat’s mobility justifying the conduct of the search without a warrant. See United States v. Hensler, 625 F.2d 1141, 1142 (4th Cir. 1980), cert. denied, - U.S. -, 101 S.Ct. 1513, 67 L.Ed.2d 814 (1981); United States v. Laughman, 618 F.2d 1067, 1073 (4th Cir. 1980), cert. denied, 447 U.S. 925, 100 S.Ct. 3018, 65 L.Ed.2d 1117 (1980). During the course of this search, they discovered numerous bales, some with marijuana residue sprinkled on top, in the two open hatches of the boat, as well as the marijuana in the galley.
The defendants raise an additional challenge to both the seizure and the search: they argue that the officers’ professed intention at the outset to conduct far more than a brief investigatory stop of the CENTAURUS — -they had planned to search the CENTAURUS thoroughly, even without probable cause — tainted the stop and search with illegality. We are not persuaded by the argument. However ill intentioned the officers, we must restrict our review to the objective circumstances of the detention in determining its lawfulness. Just as courts should not validate an objectively unreasonable search or seizure on the basis of an officer’s good faith intentions, see Terry v. Ohio, 392 U.S. 1, 22, 88 S.Ct. 1868, 1880, 20 L.Ed.2d 889 (1968), so should they steer clear of excluding evidence discovered by objectively lawful means, even if the officers harbored bad faith intent. Reliance upon objective facts and not subjective intentions in judging the legality of a search or seizure best promotes the protections of the fourth amendment. The seizure and search of the CENTAURUS in all objective respects comported with the requirements of the fourth amendment: a reasonable suspicion that the CENTAURUS contained a large quantity of marijuana allowed the officers to stop and detain the CENTAURUS briefly and to board her for investigatory questioning of the crew; the aroma of marijuana supplied probable cause to search the boat; and the exigencies of the situation eliminated the need for a warrant prior to conducting the search. Whatever the officers may have intended to do had probable cause to search not arisen, it is clear that objective circumstances made the seizure and search entirely lawful.
Finding no merit in the defendants’ arguments, we conclude, as did the district court, that the seizure and search of the CENTAURUS was lawful and that the resulting evidence of marijuana importation and possession offenses should not have been suppressed on this ground.
B. The Search of the Containers
The defendants further assert that the district court should have suppressed the marijuana on the ground that it was the fruit of an unlawful warrantless search of the bales by DEA agents. The district court held the search lawful because the defendants had no reasonable expectation *507of privacy in the bales. We agree that the search was lawful, but for the reason that the marijuana was in plain view and therefore that no warrant was required.
Our starting point is the general rule that a valid search requires that the authorities have obtained a warrant supported by probable cause and issued by a detached and neutral magistrate. See Katz v. United States, 389 U.S. 347, 357, 88 S.Ct. 507, 514, 19 L.Ed.2d 576 (1967). That rule has been recently applied by the Supreme Court in Robbins v. California, 453 U.S. 420, 101 S.Ct. 2841, 69 L.Ed.2d 744 (1981), to invalidate a warrantless search of two plastic covered bundles containing marijuana and found in the luggage compartment of a station wagon, and more recently by this court in United States v. Sharpe, 660 F.2d 967 (4th Cir. 1981), to hold unlawful the search of well packaged bales of marijuana found in the back of a camper.
Had the containers of marijuana in this case been so well packaged that no marijuana was visible to the officers, we would follow the decisions in Robbins and Sharpe and decline to uphold the warrant-less search. For, as those decisions make clear, we cannot excuse the requirement of a warrant to search the containers simply on the basis of exigent circumstances resulting from the containers’ discovery on a moving vessel, what sort of containers they are, or even their suspicious odor of marijuana. We conclude, however, that a particular variation of one of the few exceptions to the warrant requirement — the plain view exception — applies in this case and that the warrantless search of the containers of marijuana conducted by the DEA agents was lawful.
Relying upon earlier reasoning in Arkansas v. Sanders, 442 U.S. 753, 764-65 n.13, 99 S.Ct. 2586, 2593, 61 L.Ed.2d 235 (1979), the plurality in Robbins clearly acknowledged that there was a plain view exception to the bright line rule announced concerning a container search. The exception is actually in two parts. First, if the container is open and its contents exposed, its contents can be said to be in plain view. Second, if a container proclaims its contents by its distinctive configuration or otherwise and thus allows by its outward appearance an inference to be made of its contents, those contents are similarly considered to be in plain view. 453 U.S. at 422-427, 101 S.Ct. at 2844-2846. In either instance, an investigating authority need not obtain a warrant to search the container, the reasoning behind the exception being that a warrant under those circumstances would be superfluous.
The marijuana in the bales seized from the CENTAURUS was in plain view for a combination of those two reasons. As the defendants concede, some of the bales — the record is unclear on the exact number— were split open and marijuana exposed to view prior to the search, that is, the opening and sampling of the bales by DEA agents. The plain view of that marijuana, in combination with the virtually identical appearances of the other intact bales and the presence of marijuana residue on top of some of the bales noted while the bales were still on board the CENTAURUS, allowed the authorities to infer under the latter prong of the plain view exception that the bales not split open also contained marijuana.
Because the marijuana was in plain view, the DEA agents did not need to acquire a warrant prior to taking samples from the bales. The search was therefore valid and the motion to suppress on this ground properly denied.
III. Blair’s Sentence
In addition to the search and seizure arguments raised by the defendants, Blair appeals the imposition of his sentence. He argues that the sentencing was an abuse of the district court’s discretion and a denial of due process because (1) the court impermis-sibly held Blair accountable for his failure to provide further information about the smuggling operation to the government, and (2) it improperly considered Moore’s and Dodds’ failure to disclose that information in sentencing him.
*508In fashioning a sentence, a district court may, under 18 U.S.C. § 3577, consider without limitation information concerning the background, character, and conduct of the person to be sentenced.4 It may not, however, impose a sentence “on the basis of ‘misinformation of constitutional magnitude,’ ” Roberts v. United States, 445 U.S. 552, 556, 100 S.Ct. 1358, 1362, 63 L.Ed.2d 622 (1980), quoting United States v. Tucker, 404 U.S. 443, 447, 92 S.Ct. 589, 591, 30 L.Ed.2d 592 (1972), and it is upon this due process limitation to a district court’s sentencing discretion that Blair relies in arguing that consideration of his failure to supply the government with information was improper. He asserts that the district court erroneously believed that he had information about unidentified members of the drug scheme that he was unwilling to divulge, when in actuality he had no information of that sort.
Accepting for purposes of argument that such a misunderstanding would qualify as “misinformation of constitutional magnitude,” we nevertheless are not persuaded by the argument, because we find insufficient factual basis for it in the record. First, contrary to Blair’s assertion on appeal that he had no information to give the government, his own remarks to the district court prior to sentencing suggest that he did not reveal the information because he was not asked to do so: he told the court,
I have tried to cooperate with the Board. I think I am the only one of the defendants that wrote my own statement — you know; and I wasn’t asked to mention any names is the only reason I didn’t mention any names, (emphasis added).
Second, the record does not support Blair’s assertion that the district court actually relied on Blair’s failure to divulge information in imposing sentence. The court did state that it was concerned that “those who financed and stood behind this criminal venture, those who stood to gain the most, are not here in court.” Immediately thereafter, however, it said that a prison sentence for Blair was nevertheless necessary “to act as a deterrent” to young men like Blair who “willingly take the risk” for those others who would profit the most. The sentence, thus, was not imposed as retaliation for Blair’s failure to divulge names but in order to deter others from acting as fronts in a smuggling operation. Deterrence is clearly a legitimate sentencing objective. See United States v. Moore, 599 F.2d 310, 315 (9th Cir. 1979), cert. denied, 444 U.S. 1024, 100 S.Ct. 687, 62 L.Ed.2d 658 (1980).
[n]o limitation shall be placed on the information concerning the background, character, and conduct of a person convicted of an offense which a court of the United States may receive and consider for the purpose of imposing an appropriate sentence.
Blair’s contention that the district court improperly considered the failure of Moore and Dodd to reveal information to the government in sentencing him is similarly not persuasive. While it is true that the court openly expressed its concern at all of the sentencing proceedings that the key individuals behind the drug operation were escaping punishment, and that all three of the defendants received identical sentences, it cannot therefore be inferred that Blair was sentenced for Moore’s and Dodds’ reluctance to talk.
Having disposed of these contentions, we further observe that the sentence was within statutory limits and was not mechanistically imposed but was instead the result of discretion exercised in light of societal considerations and Blair’s personal circumstances. See United States v. Neidinger, 647 F.2d 408 (4th Cir., 1981). We accordingly affirm the sentence.
IV.
The search and seizure of the CENTAURUS and the search of the bales of marijuana having been lawful, the district court properly denied the defendants’ motion to suppress. The district court, moreover, did not abuse its discretion or offend due process in sentencing the defendant Blair. We therefore affirm the defendants’ convictions and Blair’s sentence.
AFFIRMED.
. The defendants do not appeal the district court’s refusal to suppress the film found aboard the CENTAURUS.
. The defendants argue that, in addition to being unconstitutionally applied, the statute does not support the marine officers’ stop of the CENTAURUS, as it references a vessel stop only to enforcement of the provisions of the subtitle in which the statute is found, that is, the State Boat Act, Md.Nat.Res.Code. Ann. § 8-701 et seq. (1974). Enforcing the State Boat Act, they assert, does not encompass the stop of a vessel suspected of illegal drug activity.
We are not persuaded by the argument. The intent of the Act, by its own terms, is “to foster the development, use, and enjoyment of all the waters of Maryland,” Id. § 8-702, and the officers were mandated to cooperate with the federal authorities “for special events or to meet emergency situations.” Id. § 8-704(b)(8). Without engaging in detailed analysis of the state statutory scheme, we conclude that the State Boat Act authorizes, to the limits allowed by the fourth amendment, the state marine police to stop and search in state waters a vessel suspected of illegal activity and to assist federal authorities in making such a stop and search. Our conclusion is supported by the statutory language of Md.Nat.Res.Code Ann. § l-204(a) (1974), which states in part, “In addition to any other powers conferred by this title, the Secretary and every natural resource *505police officer shall have all the powers conferred upon police officers of the state. These powers may be exercised anywhere within the state.”
. The fourth amendment states that “[t]he right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.” U.S.Const. amend. IV.
. 18 U.S.C. § 3577 recites that