The Vessel on Your Starboard: Inside the Give-Way Decision
Two boats meet at dusk, and the distance between them starts disappearing.
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The Vessel on Your Starboard: Inside the Give-Way Decision
This episode follows Maya Chen, a fictional Coast Guard captain, through the rules that decide which vessel moves first when two courses converge.
The central idea is simple: the vessel that has the other on its starboard side usually gives way. But that rule only works after a mariner has classified the encounter, checked for collision risk, and noticed exceptions such as overtaking, narrow channels, restricted visibility, and vessels with limited maneuverability.
The decision in one page
- Look and listen. Rule 5 requires a proper lookout by sight, hearing, and every appropriate available means.
- Decide whether collision risk exists. If the compass bearing of the approaching vessel does not appreciably change, the Rules treat that as a collision risk. If there is doubt, assume the risk exists.
- Classify the encounter. Overtaking has priority over the ordinary crossing rules. If a vessel approaches from more than 22.5 degrees abaft the other vessel’s beam, it is the overtaking vessel and must keep clear until finally past and clear.
- Apply the right branch. In a head-on situation, both power-driven vessels turn to starboard. In a crossing situation, the vessel with the other on its starboard side keeps out of the way.
- Make the maneuver obvious. The give-way vessel should act early and substantially. Small, ambiguous course changes are exactly what the rule tries to prevent.
- Keep watching. The stand-on vessel keeps course and speed at first. If the give-way vessel is not acting, or the vessels become too close, the stand-on vessel must maneuver to avoid collision.
The rules are not a substitute for seamanship or local instructions. Rule 2 preserves responsibility for special circumstances, and the inland rules contain geographic exceptions for places such as the Great Lakes and Western Rivers.
The framework in this episode comes from the U.S. Coast Guard’s Amalgamated Navigation Rules and the current 33 CFR Part 83, including the sections on risk, avoiding action, and the stand-on vessel. 12345
This is an explanation of the rules, not navigation training or advice for a live situation. Mariners must use the rules that apply to their waters, vessel, and circumstances.
References
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