Boating Right of Way Rules: Stand-On, Give-Way, and Signals

Boating right of way rules assign one vessel the role of stand-on (hold your course and speed) and the other the role of give-way (take early, clear action to stay clear), with the assignment based on what kind of boat each is and how the two paths meet. A power-driven boat yields to almost everything else. In a head-on meeting between two motorboats, both turn to starboard. In a crossing, the boat that sees the other on its right holds course. Any boat overtaking another yields, always.

Stand-On and Give-Way: The Core Mechanic

Every encounter on the water sorts the two boats into two roles. The stand-on vessel holds its heading and speed so the other operator can predict where it will be. The give-way vessel changes course or slows down, and does so early and obviously. Small last-second adjustments are the worst thing a give-way skipper can do, because they leave the other captain guessing.¹

The stand-on obligation is not absolute. If you are the stand-on boat and you can see the other operator is not doing anything to stay clear, you are allowed to maneuver on your own. Once the give-way vessel alone can no longer prevent a collision, you are required to take whatever action best avoids the crash.² No right-of-way rule entitles anyone to hold course into a collision. Rule 2 makes the point directly: the navigation rules can be departed from when necessary to avoid immediate danger, and nothing in them excuses a failure of basic seamanship.³

Which Vessel Type Yields to Which

Before the encounter rules apply, check whether your boat type already puts you in the give-way role. Rule 18 ranks vessels from least maneuverable to most, and each level yields to the ones above it:

Not under command: a boat that has lost steering or engine power and physically cannot maneuver. Everyone yields to these.
Restricted in ability to maneuver: vessels whose work prevents them from getting out of the way, such as boats laying cable, dredging, or in certain towing operations.
Engaged in fishing: commercial fishing boats with nets, lines, or trawls deployed. Recreational anglers with rods do not qualify.
Sailing vessels: boats under sail alone with no engine running. They yield to the three categories above and have priority over powerboats.
Power-driven vessels: at the bottom. A motorboat yields to every other category on this list.

A sailboat with its engine running, even if the sails are up, counts as a power-driven vessel.⁴ The hierarchy bends in a few specific situations: overtaking, narrow channels, and traffic separation schemes all override it, which the sections below cover.

Head-On Meetings Between Motorboats

When two power-driven vessels approach each other roughly head-on, neither is stand-on and neither is give-way. Both are equally obligated to turn to starboard so they pass port side to port side.⁵

If you are not sure whether you are in a head-on situation, assume you are and turn starboard. The rule is explicit that doubt equals obligation. Make the turn large enough to be visible to the other captain, whether by eye or on radar. A two-degree adjustment communicates nothing at a distance. This rule applies only between power-driven vessels; a motorboat meeting a sailboat follows the hierarchy instead.

Crossing Situations

When two power-driven vessels cross at an angle that creates a collision risk, the boat that sees the other on its starboard side yields. The boat on the right is the stand-on vessel and holds course.⁶

Think of it as yielding to the right at an uncontrolled intersection. The give-way vessel should avoid crossing ahead of the stand-on vessel. Slowing down or turning behind the other boat is almost always safer than trying to speed across its bow. At night, if you can see one of the other vessel’s colored sidelights (red or green), you are in a crossing situation. If you can only see its white stern light, you are overtaking, and a different rule takes over.

Overtaking

Any vessel approaching another from behind is overtaking and must keep clear. This overrides the vessel hierarchy. A sailboat overtaking a powerboat yields to the powerboat, even though sailboats normally have priority.³

You are overtaking when you approach from more than 22.5 degrees behind the other vessel’s beam. At night, that is the position from which you see only its white stern light. Once an overtaking situation begins, you remain the give-way vessel for the entire maneuver, even as your relative positions shift. You cannot promote yourself to a crossing situation partway through by drawing alongside. Stay far enough off to avoid interference, and be completely past and clear before resuming your original course.

Two Sailboats Meeting

The hierarchy puts sailboats above powerboats but does not resolve encounters between two boats under sail. Rule 12 handles that:

Wind on different sides: the boat with the wind on its port side gives way to the boat with wind on its starboard side.
Wind on the same side: the windward boat (closer to the wind source) gives way to the leeward boat.
In doubt: if you have the wind on your port side and see another sailboat to windward but cannot tell which side its wind is on, you give way.

For these purposes, the windward side is the side opposite the one carrying the mainsail.⁷ The pattern throughout: when the situation is unclear, take the give-way role rather than gamble on priority.

Narrow Channels

Open-water rules assume both boats have room to maneuver. Narrow channels do not. Under Rule 9, every vessel traveling along a narrow channel must keep as near to the starboard side as is safe and practical.⁸

Two further restrictions matter. You must not cross a narrow channel if doing so would impede a vessel that can only navigate safely within it. And vessels under 20 meters (about 65 feet), along with sailing vessels, may not impede a vessel confined to the channel. The hierarchy still technically applies, but a deep-draft ship stuck between the channel markers cannot dodge you, and the rules put the burden on the smaller, more maneuverable boat.

Restricted Visibility

Fog, heavy rain, or anything else that limits visibility changes how the rules work. Rule 19 applies to vessels not in sight of one another, and it effectively cancels the normal stand-on and give-way assignments. Crossing and meeting rules assume you can see the other boat.

In restricted visibility, every vessel must slow to a speed appropriate to the conditions and keep engines ready for immediate maneuvering. If you detect another vessel on radar alone and see that a close-quarters situation is developing, take avoiding action with time to spare. The rule discourages turning to port for a vessel ahead, and discourages turning toward any vessel beside or behind you. Without visual contact, an aggressive course change risks turning into the very boat you are trying to avoid.

Sound Signals on U.S. Inland Waters

On U.S. inland waters, power-driven vessels within half a mile of each other announce intentions with short blasts of a horn or whistle. These signals are proposals. The other boat must respond with the same signal to indicate agreement before either commits.

One short blast: I intend to leave you on my port side (usually a turn to starboard).
Two short blasts: I intend to leave you on my starboard side (usually a turn to port).
Three short blasts: I am operating astern propulsion (backing up).
Five or more short rapid blasts: the danger signal, meaning I do not understand your intentions or I doubt sufficient action is being taken to avoid collision.

If you hear a one- or two-blast proposal and agree it is safe, sound the same signal back and both boats proceed. If you doubt the safety of the proposed maneuver, respond with five blasts, and both boats take precautionary action until a safe arrangement is reached.⁹ For overtaking, one blast signals a pass on the other vessel’s starboard side, two blasts a pass on its port side, and the boat being overtaken must sound the same signal back before the pass proceeds.

One meaningful difference for boaters traveling internationally: on international waters, the same whistle blasts indicate the action already being taken, not a proposal. One blast means “I am altering course to starboard,” and there is no agreement protocol. The five-blast danger signal works the same under both systems.¹⁰

Safe Speed and Lookout

Every right-of-way rule assumes you have given yourself time and distance to act. Two overarching duties make that possible. Every vessel must maintain a proper lookout at all times, using sight, hearing, and any other available means, including radar and AIS.¹¹

Every vessel must also travel at a safe speed. Safe is not a fixed number. It depends on visibility, traffic, your boat’s stopping distance and turning ability, wind and current, water depth, and nearby hazards. If you use radar, you must account for its limitations, including the possibility that small boats or floating objects will not show up at useful range.¹² A speed that is perfectly safe in open water on a clear day can be reckless in a crowded harbor at dusk.

Penalties for Breaking the Rules

Under federal law, any person who operates a vessel in violation of the Inland Navigation Rules faces a civil penalty of up to $5,000 per violation, and the vessel itself can be held liable for the same amount.¹³

Grossly negligent operation that endangers life or property is a Class A misdemeanor. If it results in serious bodily injury, it becomes a Class E felony carrying an additional civil penalty of up to $35,000.¹⁴

In collision lawsuits, a rule violation triggers the Pennsylvania Rule. If your boat violated a statutory rule before the collision, the burden shifts to you to prove the violation could not have contributed to the accident. Not “probably did not.” The standard is that it certainly did not and could not have. Fail that bar and you are presumed at fault, even if the other vessel was also negligent.¹⁵ The navigation rules are the baseline courts use to assign financial liability after any collision on the water.

1
International Maritime Organization. COLREG – Preventing Collisions at Sea
2
eCFR. 33 CFR 83.17 – Action by Stand-on Vessel (Rule 17)
3
U.S. Coast Guard Navigation Center. Navigation Rules and Regulations Handbook
4
eCFR. 33 CFR 83.18 – Responsibilities Between Vessels (Rule 18)
5
eCFR. 33 CFR 83.14 – Head-on Situation (Rule 14)
6
eCFR. 33 CFR 83.15 – Crossing Situation (Rule 15)
7
eCFR. 33 CFR 83.12 – Sailing Vessels (Rule 12)
8
eCFR. 33 CFR 83.09 – Narrow Channels (Rule 9)
9
eCFR. 33 CFR 83.34 – Maneuvering and Warning Signals (Rule 34)
10
U.S. Coast Guard Navigation Center. Navigation Rules – Amalgamated International and U.S. Inland
11
eCFR. 33 CFR 83.05 – Look-out (Rule 5)
12
eCFR. 33 CFR 83.06 – Safe Speed (Rule 6)
13
Office of the Law Revision Counsel. 33 USC 2072 – Violations of Inland Navigational Rules
14
Office of the Law Revision Counsel. 46 USC 2302 – Penalties for Negligent Operations and Interfering With Safe Operation
15
Justia. The Pennsylvania, 86 U.S. 125 (1873)