Appellant was charged with possession of marijuana with intent to distribute in violation of 21 U.S.C.A. § 841(a)(1) (West 1981). Appellant was convicted in a bench trial and appeals the denial of his motion to suppress evidence. We affirm.
*1378 I. FACTS
At approximately 4:30 P.M. on March 7, 1980, an informant notified the Customs Patrol office in Miami that a 50-foot, white, yacht-type vessel with three persons on board would be coming into the area of the Coral Gables Waterway within an hour carrying a load of marijuana. The Customs Patrol promptly launched a Customs vessel which proceeded to the Coral Gables Waterway area. At approximately 5:15 P.M., Customs Patrol Officer Joseph Brookins observed a vessel which matched the description provided by the informant. The vessel, which was subsequently identified as the SUNDANCER, was entering the first waterway south of the Coral Gables Waterway and was the only vessel observed in the area at that time.
After maintaining visual contact with the SUNDANCER for approximately thirty minutes, the Customs vessel drew alongside and asked the captain, later identified as appellant Kent, where the SUNDANCER was coming from. Kent responded that he was coming from the West Palm Beach area. Officer Brookins believed that this was an “unusual response” because the SUNDANCER had been heading in a northwesterly direction when originally sighted. 1 Brookins also asked Kent where the SUNDANCER was going to dock, but Kent did not give an answer to this inquiry. Officer Brookins then decided to board the SUNDANCER, and Kent apparently agreed to permit the boarding. 2
After boarding the SUNDANCER, Brookins asked Kent for the ship’s documents. While Brookins accompanied Kent to look for the documents, 3 the other Customs Patrol officer who boarded the ship, James Carlin, began to look around the vessel. When he examined the pilot house, Carlin discovered an open doorway leading from the pilot house to the interior of the vessel. Carlin stepped into the doorway, bent over slightly due to a partially closed partition above the doorway, and took one or two steps down the stairwell leading into the lounge area. From that position, Carlin observed several large bales wrapped in burlap through a half-open door at the opposite end of the lounge which led to the forward stateroom. Recognizing that the bales were characteristic of marijuana, Carlin proceeded forward through the lounge and the galley to the forward stateroom. Carlin then confirmed that the bales contained marijuana and learned that both the forward and rear staterooms were filled with marijuana bales. Carlin informed Officer Brookins about his discoveries, and the Customs Patrol officers arrested Kent and the two other individuals on board the SUNDANCER.
II. THE STOP AND BOARDING OF THE SUNDANCER
The first issue presented on this appeal is the constitutionality of the stop and boarding of the SUNDANCER. Our cases hold that Customs officers may make investigatory stops of vessels on inland waters “on facts which justify a reasonable suspicion of illegal activity.”
United States v. Ruano,
We agree with the district court that the information contained in the informant’s tip coupled with the subsequent verification of that information gave the Customs Patrol officers a reasonable suspicion that the SUNDANCER was engaged in illegal activity. The tip indicated that a 50-foot, white, yacht-type vessel with three people on board would enter the area of the Coral Gables Waterway within an hour carrying a large load of marijuana. When the officers investigated this information, they found a vessel which matched the description given by the informant, which had three people on board, and which was entering the Coral Gables Waterway area at the time designated by the informant. Further, the Customs Patrol officers sighted no other vessels in the Coral Gables Waterway area at that time. These facts corroborated the information contained in the informant’s tip.
Appellant argues, however, that the corroborated tip could not properly provide the basis for a reasonable suspicion of illegal activity. Appellant contends that the tip was unsupported by any indicia of the informant’s reliability because the government did not present evidence which established the reliability of the informant or disclosed the source of the informant’s information. Consequently, appellant argues, the Customs Patrol officers did not have a reasonable suspicion of illegal activity when they stopped and boarded the SUNDANCER. We disagree.
Admittedly, the record does not establish the informant’s past reliability or disclose the manner in which the informant obtained his information. The Customs Patrol officer who received the tip testified only that he knew the informant and had talked to him in the past. A tip from an informant of unknown reliability ordinarily will not create a reasonable suspicion of criminality. See
United States v. McLeroy,
We believe that the tip the Customs Patrol officer received was similar to the tip in
Adams v. Williams, supra.
In that case, an informant of unproven reliability advised a police officer that “an individual seated in a nearby vehicle was carrying narcotics and had a gun at his waist.”
Id.
at 145,
After the Customs Patrol officers received the tip, they conducted an indepen
*1380
dent investigation of the information provided by the informant. This court has held that “[wjhere insufficient information about the tip and the tipster is available to justify reliance on it alone, investigating officers may supplement the tip by surveillance of the subject or corroboration of key elements of the tip from relatively objective sources.”
United States v. Brennan,
Several previous decisions by this court support our conclusion that a tip from a known, albeit unproven, informant coupled with subsequent corroboration of the tip’s details can justify a reasonable suspicion of criminality. In
United States v. Afanador,
In summary, we hold that the Customs Patrol officers who stopped and boarded the SUNDANCER had facts which justified a reasonable suspicion of illegal activity. Although the tip which they received was from an informant of unproven reliability, the tipster’s identity was known arid he had talked to one of the officers in the past, the tip included facts regarding a vessel’s future location which normally would be available only to a limited number of persons who had personal knowledge of the vessel’s activities, the information contained in the tip could be objectively verified, and the officers’ subsequent investigation corroborated every key element of the tip except the presence of marijuana. Under these circumstances, the stop and boarding of the SUNDANCER was not unreasonable and, therefore, did not contravene the Fourth Amendment. 9
III. THE DISCOVERY OF THE MARIJUANA
The second issue presented by this appeal is the constitutionality of the discovery of marijuana in the interior of the SUNDANCER. The government contends *1382 that Officer Carlin observed the marijuana in plain view from a position where he had a legitimate right to be. 10 Appellants argue that the plain view doctrine does not justify Officer Carlin’s discovery of the marijuana.
Under the plain view doctrine, “[a] law enforcement officer may seize an item in plain view without a warrant if the officer (1) has an independent and legally sufficient justification for being in the position from which he can view the item, (2) immediately recognizes the item as evidence, and (3) discovers the evidence inadvertently.”
United States v. Antill,
Appellant’s first contention is that Officer Carlin did not view the marijuana from a position where he had a right to be. Appellant points out that Officer Carlin took one or two steps down a stairway leading to the lounge area of the SUN-DANCER before he observed the marijuana bales. This action, appellant argues, constituted an unreasonable intrusion into the vessel’s “private living quarters” in violation of the Fourth Amendment. 11
This court has not yet determined the minimum degree of suspicion necessary for law enforcement officers to search the private living quarters of a vessel.
See United States v. Gray,
United States
v.
Alfrey,
Appellant admits that in some cases law enforcement officers have a right to make a protective sweep after boarding a vessel. Nevertheless, appellant contends that the discovery of the marijuana was illegal in this case because Officer Carlin had an improper motivation when he stepped onto the stairwell which led to the lounge area. According to appellant, Officer Carlin was looking for contraband rather than attempting to ascertain whether there were any people below who might pose a threat to the safety of the boarding party. However, even if we accept appellant’s argument that Officer Carlin’s primary purpose was to look for contraband, the record clearly indicates that Officer Carlin also was checking to make sure that there were no additional persons aboard the SUN-DANCER.
14
We have previously determined that the lawfulness of the boarding of a vessel is not vitiated by the fact that the officer in charge had mixed purposes, both to make a document and safety check and to search for contraband.
See United States
v.
Jonas,
Appellant’s second contention, that the plain view doctrine does not apply because Officer Carlin did not immediately recognize that the bales were contraband, is without merit. Law enforcement officers “are not required to ignore the significance of items in plain view even when the full import of the objects cannot be positively ascertained without some examination.”
United States
v.
Roberts,
For the foregoing reasons, the judgment of conviction is
AFFIRMED.
Notes
. After examining nautical maps at the suppression hearing, Officer Brookins conceded that the SUNDANCER could have been coming from the West Palm Beach area even though it was heading northwest when sighted.
. The government contends that Kent consented to both the boarding and a search of the SUNDANCER. Because we conclude below that the officers’ reasonable suspicion justified the boarding and that the officers then found the marijuana in plain view, we need not consider the consent issue.
. Kent apparently was unable to produce the documents.
. In
Bonner v. City of Prichard,
. Other courts have recognized the difference between a tip from an anonymous telephone
*1380
informant and an informant who, while of unproven reliability, is known to the law enforcement officer.
See, e.g., United States v. Sierra-Hernandez,
. After making the statement quoted in the text, the court in
United States v. McLeroy
went on to hold that the facts known to the law enforcement officers did not justify an investigative stop of the defendant’s automobile. The police had stopped the automobile after receiving information that a black and white Chevrolet with a particular license number was parked at the defendant’s home. The tipster indicated that the vehicle had a damaged right side, was possibly stolen, and might have been involved in a hit-and-run accident. The tipster also suggested that the defendant might be carrying a sawed-off shotgun. There was no indication that the police had talked to the informant previously, and “the only elements of the tip corroborated by the police investigation were the suspect’s name and address and the description of his automobile.”
. It is possible that a tip describing a vessel and accurately predicting its future location could come from a prankster who merely observed the vessel’s location, speed and heading. That is a remote possibility in this case, however, because the Customs Patrol officer who received the tip knew the informant’s identity.
. We believe that the facts of this case present a stronger basis for a reasonable suspicion of criminality than the facts in several other circuit court decisions which have upheld investigatory stops based
on the corroboration of
innocent details contained in tips received from
anonymous
informants.
See United States v. McClinnhan,
. Because we believe that the corroboration of the informant’s tip justified a reasonable suspicion of criminal activity, we do not need to consider the effect of Officer Brookins’ questions and Kent’s unsatisfactory responses when the Customs Patrol vessel drew alongside the SUNDANCER. At oral argument, the government’s attorney suggested that the Customs Patrol officers did not stop the SUNDANCER until after questioning Kent. If that were the case, Kent’s unsatisfactory responses gave the officers additional information to justify the stop and boarding of the SUNDANCER. Even if the officers stopped the SUNDANCER before asking questions, we note they did not take the more intrusive step of boarding the SUN-DANCER until after questioning Kent.
. Our conclusion that the marijuana was discovered in plain view makes it unnecessary to consider the government’s additional argument that the defendant does not have standing to contest the discovery of the marijuana.
. We need not decide whether appellant has properly characterized the entire interior of the SUNDANCER as “private living quarters.” The vessel’s interior included a lounge area, a galley, and two staterooms. Both the lounge area and the galley apparently were open to all persons on board the vessel. We note that dicta in one of our prior cases involving a commercial, as opposed to a private, vessel indicates that “neither captain nor crew has a legitimate expectation of privacy protected by the Fourth Amendment in an area which is subject to the common access of those legitimately aboard the vessel.”
United States v. Freeman,
. In
Stein v. Reynolds Securities, Inc.,
.
Cf. United States v. Freeman,
. At the suppression hearing, Officer Carlin stated that he always checks around a vessel after boarding to make sure that the crew is accounted for and that there are no individuals with weapons on board. In this regard, the trial judge noted:
This gentlemen [Officer Carlin] ... did what he regularly does because he is enjoying life to some degree; notwithstanding the work he is in, he wants to stay alive ... [I]n today’s world of drug smuggling, a police officer is a little bit nutty if he doesn’t look down in the hold to see if there is somebody else crouched down there, because weapons are on the boats and [were] on this boat, so I don’t see anything unreasonable about looking into the hold ....
. In
United States v. Alonso,
