What is the rule 18 for ships

So, Rule 18 of the COLREGS? It's basically the maritime pecking order. The whole point is figuring out who has to get out of the way and who gets to just keep going when two boats might hit each other. From tiny sailboats to giant tankers, everyone needs this rule. Get it wrong, and you're looking at a collision and a whole lot of legal trouble. That's the gist of it.

What is the basic hierarchy established by Rule 18?

Rule 18 lays out a pretty straightforward chain of command. The idea is simple: the less you can maneuver, the more right of way you have. Here's how it breaks down, from top dog to lowest on the totem pole:

• Vessel not under command (NUC): Think steering failure, engine out—something's gone seriously wrong. They can't maneuver at all. Top priority, no questions asked.
• Vessel restricted in her ability to maneuver (RAM): These boats are working. Dredging, surveying, towing, laying cables—their job limits how they can move. They're next in line.
• Vessel constrained by her draft: A big ship in shallow water, basically. They can't exactly zig-zag because they'll run aground. Pretty restricted.
• Fishing vessel: Any boat actively fishing with gear that tangles or restricts them. Nets, trawls, that sort of thing.
• Sailing vessel: Just sails, no engine running. They're pretty nimble compared to the others.
• Power-driven vessel: Anything with a motor. You're at the bottom. You give way to everyone else.

How does Rule 18 apply between a sailing vessel and a fishing vessel?

People get tripped up on this one all the time. Yeah, a sailboat usually has right of way over a powerboat. But Rule 18 flips that. A sailboat has to get out of the way of a fishing boat that's actually fishing. Why? Because that fishing boat has nets or lines out—they can't just turn on a dime. So the sailboat, being more maneuverable, is the one that has to move.

What is the "stand-on" and "give-way" obligation under Rule 18?

Rule 18 doesn't operate in a vacuum. It works with the other steering rules (Rules 11-17). Once you know who's who, here's what happens:

• Stand-on vessel: You've got the right of way. Hold your course and speed. But—and this is big—you can't just blindly assume the other guy will move. If it's clear they're not doing anything, you have to act to avoid a crash.
• Give-way vessel: You're lower on the list. Take early, obvious action to stay clear. A big, clear change in course or speed. None of this piddly little rudder adjustments.

Does Rule 18 apply to all vessels in all conditions?

Not exactly. Rule 18 isn't some magic shield. It's subject to Rule 2 (the responsibility rule) and Rule 6 (safe speed). Rule 2 basically says you can't be an idiot just because you have right of way. You still have to act like a responsible mariner. And Rule 6 says everyone, always, has to go at a safe speed. So yeah, even the stand-on vessel has to be smart about it.

Practical Checklist for Applying Rule 18

• Identify vessel type: Is that thing NUC? RAM? Fishing? A sailboat? A powerboat? Figure it out.
• Check for signals: Look for day shapes (balls, diamonds, cones) and lights (red over red, red over white). They tell you what the other boat is doing.
• Determine hierarchy: Run through the Rule 18 list. Who's the stand-on? Who's the give-way?
• Take early action: If you're the give-way, make a big, obvious move. Don't wait until the last second.
• Monitor the situation: If you're the stand-on, hold your course but stay alert. If the other guy doesn't move, you might have to.
• Consider other rules: Rule 18 isn't the only game in town. Always remember safe speed (Rule 6) and keeping a proper lookout (Rule 5).

Frequently Asked Questions