According To Navigation Rules Which Of The Following Is True

Understanding Maritime Navigation Rules: Core Principles That Are Always True

When encountering the phrase “according to navigation rules which of the following is true,” it often stems from a multiple-choice question in a boating safety course or maritime exam. However, the fundamental truths embedded within international navigation rules are far more critical than any single test question. These rules, formally known as the International Regulations for Preventing Collisions at Sea (COLREGs), are not mere suggestions but a globally binding legal framework designed to save lives, protect property, and preserve the marine environment. At their heart lies a simple, profound truth: every vessel, regardless of size or purpose, has an absolute and non-delegable duty to take all necessary action to avoid a collision. This article unpacks the foundational, universally true principles that form the bedrock of safe navigation, moving beyond hypotheticals to the actionable responsibilities every mariner must internalize.

The Foundational Truth: The Primacy of Collision Avoidance

The single most important and unequivocal truth in all navigation rules is Rule 2: Responsibility. It states that nothing in these rules shall exonerate any vessel, owner, master, or crew from the consequences of any neglect to comply with these rules or from the neglect of any precaution that may be required by the ordinary practice of seamen or by the special circumstances of the case. In plain language: the rules are a last line of defense, not a substitute for common sense and proactive seamanship. The ultimate goal is to prevent a collision, and if following a specific rule to the letter would lead to an accident, you must break from it to take evasive action. This principle overrides all others. Your legal and moral duty is to avoid a collision, full stop.

The Four Pillars of Safe Navigation: Always True Rules

Several core rules are absolute truths that apply in virtually every situation. Mastering these is non-negotiable for safe boating.

1. The Duty to Maintain a Proper Look-out (Rule 5)

This is the first and most fundamental operational rule. A proper look-out by sight and hearing, as well as by all available means (such as radar, AIS, VHF radio), must be maintained at all times. This is not a passive act; it is an active, continuous process of assessing the entire navigational situation. The truth here is multifaceted:

• Solemn Obligation: No other task—fishing, chart work, resting—can supersede the look-out duty when there is a risk of collision.
• Holistic Assessment: It requires integrating all sensory inputs. You cannot rely solely on radar in fog or solely on sight at night.
• Early Detection: The entire collision avoidance system depends on this rule. Failure to see another vessel early enough is the primary cause of collisions.

2. The Requirement for a Safe Speed (Rule 6)

“Safe speed” is defined by the conditions, not by the engine’s capability. The following factors must be considered:

• Visibility, traffic density, and the maneuverability of your vessel.
• The background light at night (e.g., lights on shore can obscure small craft lights).
• The state of wind, sea, and current.
• The proximity of navigational hazards.
• Your vessel’s stopping distance and turning capability. The immutable truth: There is no such thing as “reasonable speed” in a vacuum. Your speed is only safe if you can stop in half the distance you can see to avoid an obstacle, a concept known as the “half-speed rule” for good seamanship. Excessive speed in restricted visibility is a direct violation of this rule and a leading cause of serious accidents.

3. The Risk of Collision: Action to Avoid (Rule 8)

When you determine that a risk of collision exists, positive, substantial, and early action must be taken. Key truths within this rule:

• Alterations Must Be Substantial: A small course change that leaves doubt in the mind of the other vessel is insufficient. The alteration should be large enough to be readily apparent on the other vessel’s radar or by visual observation.
• Avoid Series of Small Alterations: This is a hallmark of indecision and creates confusion. One clear, decisive action is preferred.
• Slow or Stop: Reducing speed or stopping is a perfectly valid and often safest action. It is not a sign of weakness but of prudent seamanship.
• No Exoneration: Even if you are the “stand-on” vessel (see below), if it becomes clear the “give-way” vessel is not taking action, you must act to avoid collision. Your duty never ceases.

4. The Clear Hierarchy of Vessel Types (Rules 13-18)

The rules establish a strict, unambiguous pecking order to determine who must give way. The truths are black and white:

• Power vs. Power: When two power-driven vessels meet head-on, both must alter course to starboard (Rule 14). There is no “stand-on” vessel in a pure head-on situation; both are give-way vessels.
• Crossing Situation: When two power-driven vessels cross, the vessel which has the other on her own starboard side must keep out of the way (the “give-way” vessel). The other is the “stand-on” vessel (Rule 15).
• The Stand-On Vessel’s Duty: The stand-on vessel shall maintain its course and speed (Rule 17). However, it must take action if the give-way vessel fails to act, if collision becomes imminent, or if it becomes apparent the give-way vessel is not taking appropriate action. Maintaining course and speed is not passive; it is an active part of the maneuver to allow the give-way vessel to pass safely.
• Sailing Vessels: Generally, a sailing vessel has right of way over a power-driven vessel (Rule 18), but this is overridden by specific rules for vessels engaged in fishing, vessels constrained by their draft