Boat Rules: Lights & Signals

Learn the international Rules of the Road (COLREGs) and be ready for your boating or captain's exam.

LIGHTS & SHAPES TRAINER Pick one of 12 vessels: power-driven, sailing, towing, trawling, fishing, not under command, restricted, constrained by her draft, pilot, at anchor or aground. Tap a position around her and see exactly which lights you would see at night, or which shapes by day, and what you should do.

REAL EXAM QUESTIONS Practice with questions from the U.S. Coast Guard's published Rules of the Road sample exams, plus our own questions on lights and shapes. Every answer comes with a short explanation and the rule it comes from. Answers are shuffled every time, so you learn the rule, not the position.

A PLAN TO YOUR EXAM DATE Set your exam date and the app spreads the questions over the days left. Questions come back just before you would forget them; the ones you get wrong come back sooner. One daily reminder tells you how many are waiting.

KNOW HOW READY YOU ARE Your readiness score shows how many of 30 you would get right on a practice test today, against a 90% pass mark.

PRACTICE TESTS 30 questions from every topic, timed, with no feedback until you submit, then a breakdown by topic.

U.S. INLAND RULES Sailing on U.S. inland waters, the Great Lakes or the Western Rivers? Turn on the Inland Rules in Settings to add the Coast Guard's inland questions.

EVERYTHING INCLUDED One purchase. No subscription, no ads, no account. Works offline. Your data stays on your iPhone.

NOTE Boat Rules is a study aid, not a navigation aid. It does not replace the official Navigation Rules, proper training or local regulations. Questions marked "USCG sample exam" are reproduced from the U.S. Coast Guard National Maritime Center sample examinations. Boat Rules is independent and not affiliated with the U.S. Coast Guard, the IMO or any licensing authority.

Discovery signals