USCG Captain’s License Study Guide 2026-2027: OUPV & Six-Pack Exam Prep: Rules of the Road, Chart Plotting, Navigation & Safety with 640+ Practice ... Explanations (The Barrios Captain's Method)

You passed everything… except the one module that counts twice.Here is the trap nobody warns you about: the U.S. Coast Guard OUPV / Six-Pack exam is four separately scored tests — and two of them, Rules of the Road and Chart Plotting, demand 90% to pass. You can know your knots cold, breeze through Deck General and Navigation General… and still walk out failed because a single lights-and-shapes question or one flipped sign on a TVMDC problem dragged a 90% module to 88.That is exactly how good boaters lose a whole testing day — and the fee, and the momentum. Most “prep” only makes it worse: scraped-together question dumps with no explanations, decades-old guides that don’t match today’s exam, and walls of gray text trying to teach you to recognize a buoy or read a chart with no clear pictures at all. The clock keeps running, the diagrams blur in your head, and the charter dream that made you sign up starts to feel further away.This 2026–2027 guide is engineered to defuse the precise points where candidates fail. It teaches the entire exam from the ground up — then hammers the 90% modules first, because that is where licenses are won or lost. And because Rules of the Road and Chart Plotting are visual subjects, this book actually shows you: original, exam-style diagrams of lights, day shapes, buoys, and chart excerpts that text-only competitors simply cannot give you. By the time you sit down, the patterns are automatic, the math is a checklist, and the anxiety has nowhere left to live.HOW THIS BOOK GETS YOU TO “PASS”Built around the 90% modules: Rules of the Road and Chart Plotting come first and hit hardest — the two tests that fail the most candidates.See it, don’t just read it: original diagrams for lights, day shapes, buoys, day-board colors, and chart plots — the visual edge over every text-only guide.640+ realistic practice questions: four full-length exams that mirror the real module split so test day feels familiar.Every answer explained: learn why the right answer is right and why the tempting wrong one is bait — so traps stop working on you.Chart plotting made simple: TVMDC, the 60D = S×T formula, set and drift, and anchor scope broken into repeatable, under-pressure steps.Rules of the Road, decoded: lights, shapes, sound signals, and right-of-way — with International vs. Inland differences made crystal clear.“The Tricky Five” trap drill: the exact high-failure questions that sink 90% modules, isolated and defeated before they cost you points.Last-minute confidence: quick-reference plates (lights, buoyage, sound signals), a one-page plotting cheat sheet, and an exam-day checklist.A plan you can actually keep: a 30-day study calendar, a module score tracker, and a full glossary turn cramming into steady, repeatable progress.Beyond the Six-Pack: a head start toward the 25/50/100-Ton Master upgrade, so your license can grow with your career.Work it in small, honest sessions. As you finish each set and each full-length exam, the methods turn automatic, your timing steadies, and the doubt that follows most candidates into the testing room is replaced by the calm of having already done this — dozens of times. Then you do the thing you actually came for: pass all four modules, earn your credential, and start getting paid on the water.Your charter, your tours, your dive trips, your six paying passengers — they start on the other side of this exam. Scroll up, click “Buy Now,” and start the plan today.Disclaimer: This book is an independent study guide and is not endorsed by, affiliated with, or authorized by the United States Coast Guard (USCG), the National Maritime Center (NMC), or any government agency. USCG and OUPV are used for nominative reference only. Read more