Head-On Situations (Rule 14)

Introduction

This lesson addresses one of the three primary "in-sight" encounters: the head-on situation. The rules for this encounter are detailed in Rule 14 - Head-on Situation. Understanding how to recognize and respond to head-on situations is critical for collision avoidance, and the differences between International and Inland rules in this scenario have been the cause of numerous accidents.

Defining a Head-On Situation (Rule 14)

Rule 14(a) states that it applies "when two power-driven vessels are meeting on reciprocal or nearly reciprocal courses so as to involve risk of collision". This rule applies only to power-driven vessels. A sailing vessel meeting a power-driven vessel is governed by Rule 18 (Hierarchy).

A mariner must be able to recognize this situation developing by day and by night.

Rule 14(b) - Recognition

Daytime Recognition: A vessel "observes the corresponding aspect of the other vessel". In simple terms, you see the other vessel "bow-on." You are looking at its front, and it is looking at yours.

Night-time Recognition: A vessel "would see the masthead lights of the other in a line or nearly in a line, and/or both sidelights".

The phrase "and/or" is critical. On a dark night, a mariner on a large ship may see the two white masthead lights of an approaching vessel align at a distance of 4-5 nautical miles, well before the vessel's colored sidelights (visible at 2-3 miles) come into view. The moment those masthead lights are "in a line," the situation is already defined as head-on, and a risk of collision is presumed. Seeing both the red and green sidelights simultaneously is the final, unmistakable confirmation that the other vessel is pointing directly at you.

Required Action (Rule 14(a))

Unlike a crossing situation, a head-on meeting is not a "stand-on" and "give-way" scenario. Rule 14(a) is a "both-give-way" rule.

The rule is simple and unambiguous:

"...each shall alter her course to starboard so that each shall pass on the port side of the other"

Both vessels are required to take positive and early action (in accordance with Rule 8) by turning to their own starboard (right). This will naturally separate the vessels so they pass each other port-to-port (left side to left side), just like two cars passing on a road. A turn to port is explicitly forbidden.

The Rule of Doubt (Rule 14(c))

What if a mariner is unsure? What if the other vessel is nearly reciprocal, but perhaps a few degrees off the port or starboard bow?

Rule 14(c) resolves this:

"When a vessel is in any doubt as to whether such a situation exists, she shall assume that it does exist and act accordingly"

If an approaching vessel is near the bow and there is any question whether it is a head-on or a fine-bow crossing situation, the mariner must assume it is head-on (Rule 14) and alter course to starboard. This is the safest default action, as it immediately begins port-to-port separation.

CRITICAL DIFFERENCE: Inland Rules 14(d) & 9(a)(ii) - The "Downbound" Vessel

This is one of the most significant and dangerous differences between the International and Inland rulebooks. In specific U.S. Inland waters, Rule 14(a) is completely overridden.

Inland Rule 14(d) states:

"Notwithstanding paragraph (a)... a power-driven vessel operating on the Great Lakes, Western Rivers, or waters specified by the Secretary, and proceeding downbound with a following current shall have the right-of-way over an upbound vessel..."

This same principle is mirrored in Inland Rule 9(a)(ii) for narrow channels.

Why This Rule Exists

This creates a "stand-on/give-way" situation out of what would be a "both-give-way" situation internationally. The reasoning is based on simple physics-a concept drawn from the "limitations of the vessels involved" (Rule 2(b)):

• The downbound vessel (with the current) has significantly reduced maneuverability and requires a much greater distance to stop
• The upbound vessel (against the current) has excellent control. It can use its engines against the current to slow, stop, or hold its position in the water with relative ease

Therefore, the law places the burden of action entirely on the upbound vessel, which becomes the give-way vessel. The downbound vessel is the stand-on vessel and holds its course and speed.

Example Scenario (Inland - Mississippi River)

• Situation: Vessel A (upbound, against current) and Vessel B (downbound, with current) are meeting head-on
• Rule: Inland Rule 14(d) applies. Vessel B (downbound) is the Stand-On vessel. Vessel A (upbound) is the Give-Way vessel
• Vessel B (Action): Proposes the passage. Sounds one short blast (•) ("I intend to leave you on my port side") and maintains course and speed as the stand-on vessel
• Vessel A (Action): Hears the proposal. Agrees to the safe passage. Sounds one short blast (•) in reply ("I agree"). Simultaneously, Vessel A (the give-way) takes "early and substantial action," altering course to starboard to pass port-to-port, or slowing/stopping to let Vessel B pass clear
• Result: A safe passage is agreed upon and executed

CRITICAL DIFFERENCE: Maneuvering Sound Signals (Rule 34(a))

The second profound difference in a head-on situation is the "philosophy of sound" between the two rule sets. Both systems use one short blast (•) for a port-to-port passage, but the meaning of that blast is completely different.

International Rules (COLREGS): Signals of Action

Under International Rule 34(a), a short blast is a statement of fact.

• One short blast (•) means: "I am altering my course to starboard"

A mariner makes the turn and sounds the blast simultaneously. No reply is required or expected. The signal is simply an audible component of the "readily apparent" action required by Rule 8.

Inland Rules: Signals of Intent

Under Inland Rule 34(a), a short blast is a proposal that requires agreement.

• One short blast (•) means: "I intend to leave you on my port side"

The signal is sounded before the maneuver. The other vessel is then required to reply:

• Agreement: The other vessel "shall, if in agreement, sound the same whistle signal..."
• Disagreement/Doubt: If the other vessel does not agree or is confused, it must sound the danger signal (five or more short blasts), as prescribed in Rule 34(d)

This "proposal-and-agreement" system is legally mandatory in Inland waters. A mariner who sounds one blast and immediately turns before receiving an agreeing signal is in violation of the rules. If no agreement is reached (e.g., no reply, or a danger signal is heard), the mariner must not proceed with the proposed maneuver, must sound their own danger signal, and must slow, stop, or reverse (Rule 8(e)) until a safe passing agreement is established, often via bridge-to-bridge radiotelephone.

Scenario Analysis

Scenario (International Waters)

• Situation: Two power vessels are 4 miles apart, head-on
• Vessel A (Action): Assesses risk (Rule 7), determines head-on (Rule 14b). Makes a "positive and readily apparent" (Rule 8) alteration of course to starboard. While turning, sounds one short blast (•) (Rule 34a)
• Vessel B (Action): Simultaneously assesses risk (Rule 7). Makes a "positive and readily apparent" alteration to starboard. While turning, sounds one short blast (•) (Rule 34a)
• Result: The vessels pass safely port-to-port

Case Study in Failure: NTSB Report - USCGC Winslow Griesser / Desakata

The 2022 collision between the USCGC Winslow Griesser and the center-console boat Desakata highlights the foundational failures that lead to collisions. While the NTSB ultimately determined this was a crossing situation where neither vessel saw the other, the underlying principles are universal.

The probable cause was a failure of both vessels to maintain a proper lookout (Rule 5) and thus a failure to ever assess the risk of collision (Rule 7). Because the situation was never detected, Rule 14 (or 15) was never applied.

This demonstrates that the steering rules are useless if the foundational "assess" step is skipped.

Key Takeaways

• Rule 14 applies ONLY to power-driven vessels meeting on reciprocal or nearly reciprocal courses
• Night recognition: Masthead lights in a line and/or both sidelights visible
• Required action: BOTH vessels alter course to starboard (both-give-way rule)
• Rule of doubt (14c): If unsure if head-on, assume it is and turn to starboard
• CRITICAL INLAND DIFFERENCE: Downbound vessels (with current) have right-of-way over upbound vessels on Great Lakes, Western Rivers, and specified waters (Rule 14d)
• CRITICAL SIGNAL DIFFERENCE: International signals indicate ACTION (I am turning), Inland signals indicate INTENT (I intend to turn) requiring agreement
• Inland signals require proposal-agreement exchange before maneuvering
• Failure to maintain lookout (Rule 5) and assess risk (Rule 7) negates all steering rules