Calling Starboard

Two boats, one call: who gives way? Instant right-of-way training for sailors, with every scenario citing the exact COLREGS rule. 100% offline, no account needed.

Two boats. One collision course. Who has to give way?

Calling Starboard is a fast, focused trainer for sailing's right-of-way rules - the ones every sailor needs to answer instantly, not work out from first principles. Built for anyone studying for a sailing qualification, racing competitively, or just wanting rule recall that's actually automatic.

THE THREE RULES

Every encounter between two sailboats comes down to one of three situations under the COLREGS, International Regulations for Preventing Collisions at Sea:

• Port vs. Starboard tack - opposite tacks always resolve the same way • Windward vs. Leeward - same tack, the boat further upwind gives way • Overtaking - the boat coming from clear astern always gives way, regardless of tack

HOW IT WORKS

Each round drops two boats onto a randomized collision course. Tap the boat you think must give way, or use the on-screen buttons. Get instant feedback: right or wrong, with the exact rule that decided it (Rule 12(a), 12(b), or Rule 13), explained in plain language.

Swipe between rounds, build a streak, and watch your accuracy improve rule by rule.

BUILT FOR REAL LEARNING

• Instant, rule-cited feedback after every call - never just "correct" or "wrong" • Lifetime stats: accuracy, current and best streaks, and a breakdown by rule so you know exactly where to focus • Two wind indicator styles - a simple arrow for a quick read, or a full compass rose with graduated bearings for more detail • Color-blind friendly and high-contrast display modes - every boat is always labeled P or S regardless of color settings • A shareable 8-character scenario code for every round, useful for reviewing or discussing a specific situation

PRIVATE BY DESIGN

Calling Starboard works completely offline. No account, no sign-in, no ads, no analytics, and no data ever leaves your device - your stats are stored locally and nowhere else.

WORKS IN YOUR LANGUAGE

Available in English, French, German, Italian, Spanish, Dutch, Japanese, Polish, Swedish, Norwegian, and Danish, with nautical terminology checked against how sailors actually speak in each language, not just translated. Matches your iPhone's language automatically, or pick one manually in Settings.

A universal app for iPhone and iPad.

Whether you're prepping for an RYA theory exam, sharpening your reflexes before a race, or just curious how these rules actually work, Calling Starboard turns "who gives way?" into instinct.