You cannot legally refuse a Coast Guard boarding. Federal law gives Coast Guard officers authority to board any vessel subject to U.S. jurisdiction at any time, without a warrant, without probable cause, and without any suspicion that you have done something wrong. Refusing to stop or physically blocking a boarding party is a federal crime that can send you to prison for up to five years.
Why the Answer Is No
The boarding power comes from 14 U.S.C. § 522, which lets commissioned, warrant, and petty officers go aboard any vessel subject to U.S. jurisdiction “at any time” to prevent, detect, and suppress violations of federal law. The statute lets them examine documents, inspect the vessel, ask questions, and “use all necessary force to compel compliance.”1Office of the Law Revision Counsel. 14 USC 522 – Law Enforcement
This is not a traffic stop. A police officer needs reasonable suspicion to pull over a car. The Coast Guard needs nothing. The Supreme Court upheld that distinction in United States v. Villamonte-Marquez (1983), reasoning that fixed checkpoints are impractical on open water because vessels can travel in any direction.2Justia US Supreme Court. United States v. Villamonte-Marquez, 462 U.S. 579 (1983)
The practical consequence: consent is irrelevant. When a Coast Guard vessel signals you to stop, that is a lawful order, not a request. The same authority reaches U.S.-documented vessels on the high seas anywhere in the world.
Penalties for Refusing to Heave To
Under 18 U.S.C. § 2237, anyone who knowingly fails to heave to when ordered by a federal law enforcement officer faces up to five years in federal prison, a fine, or both. The penalties climb quickly if anyone gets hurt:3Office of the Law Revision Counsel. 18 USC 2237 – Criminal Sanctions for Failure to Heave To, Obstruction of Boarding, or Providing False Information
- Standard refusal: up to 5 years in prison and a fine.
- Refusal causing serious bodily injury: up to 15 years.
- Refusal resulting in death, attempted kidnapping, or an attempt to kill: any term of years up to life imprisonment.
Recreational vessel operators face additional exposure. Under 46 U.S.C. § 4311, willfully failing to follow a boarding officer’s directions can bring a fine of up to $5,000, up to one year in prison, or both.4Office of the Law Revision Counsel. 46 USC 4311 – Penalties Civil penalties for a related series of violations can reach $250,000.5eCFR. 33 CFR 177.08 – Penalties
Section 522 also authorizes the Coast Guard to use “all necessary force to compel compliance,” which can include disabling your vessel to get a boarding team aboard. Running or fighting back adds obstruction and assault charges on top of the refusal itself. Nothing about resistance improves your position.
What to Expect Once You Stop
A boarding typically takes 15 to 30 minutes. Officers may signal you by marine VHF radio, flashing lights, loudspeaker, or by coming alongside. You are expected to slow down, stop, or adjust course and speed so the boarding team can safely come aboard.
Boarding parties usually number three or more. One officer stays with you and asks questions while the others inspect. Expect an early question about whether there are weapons aboard; a yes or no answer, plus telling them where any weapons are, is what’s called for.
The inspection focuses on federal safety equipment and vessel documentation:
- Personal flotation devices in serviceable condition, one properly sized for each person aboard.
- Fire extinguishers, properly charged and currently certified.
- Visual distress signals that haven’t expired.
- A horn, whistle, or other sound-producing device meeting federal requirements.
- Current registration numbers or Coast Guard documentation papers.
If everything checks out, the team leaves and you continue your trip. A boarding report on Coast Guard Form CG-4100 documents every boarding and can be referenced in any later proceeding. You will typically be asked to sign it to acknowledge the findings; signing does not mean you agree with them.
Rights You Keep During a Boarding
Cooperating with the boarding itself does not mean giving up every constitutional right. The Fifth Amendment still applies on the water. You must produce your documentation and safety equipment on request, but you are not required to answer questions that could incriminate you. Where you’ve been, what you’re carrying, whether you’ve been drinking, are all questions you can politely decline to answer. You do not need to volunteer information.
You can also refuse consent to searches beyond the standard safety and documentation check. If an officer asks to look through personal bags or open a locked cabin, a calm “I don’t consent to that search” is the right response. Whether the officer proceeds anyway depends on what they’ve observed, but stating your refusal preserves your ability to challenge the search in court later.
If officers search over your objection, do not physically resist. Obstruction charges compound fast, and nothing you do in the moment stops a search that’s already underway. Note the boarding officers’ names and identification numbers, the time, and the location. The courtroom is where an unlawful search gets challenged, not the deck of your boat.
When a Safety Check Becomes Something More
Section 522 authorizes the Coast Guard to “examine, inspect, and search” vessels, which is broader language than most law enforcement agencies operate under.1Office of the Law Revision Counsel. 14 USC 522 – Law Enforcement Courts have consistently upheld safety and documentation inspections done without any suspicion of criminal activity.
The line shifts when officers see or smell something during the routine check. Contraband in plain view, the smell of marijuana, or incriminating statements give the boarding team grounds to expand the search into locked compartments, personal bags, and private living quarters that would not otherwise be opened. Arguments after the fact that officers lacked probable cause have historically failed when the initial boarding was lawful under § 522. The constitutional protections you expect on land do not apply the same way on the water.
Boating Under the Influence
The most common charge to come out of a routine boarding is BUI. Federal law sets the threshold at a blood alcohol concentration of 0.08 percent while operating a recreational vessel.6eCFR. 33 CFR 95.020 – Standard for Under the Influence of Alcohol or a Dangerous Drug Penalties under 46 U.S.C. § 2302 include a civil penalty of up to $5,000 or prosecution as a Class A misdemeanor, which carries up to one year in jail.7Office of the Law Revision Counsel. 46 USC 2302 – Penalties for Operating a Vessel While Under the Influence State authorities can also bring their own charges from the same incident.
Federal implied consent under 18 U.S.C. § 3118 treats anyone operating a vessel in waters under federal jurisdiction as having consented to chemical testing if arrested for operating under the influence. Refusing a breath, blood, or urine test after being informed of the consequences results in a one-year loss of operating privileges, and the refusal itself can be used against you in court.8Office of the Law Revision Counsel. 18 USC 3118 – Implied Consent for Certain Tests