Ahoy: Sailing Pocket Guide

Every flag, light, buoy, cloud and signal, one glance away. Free to use, no account needed. Unlock full offline access with Ahoy Pro.

Ahoy is a pocket field guide for sailors. Pull it out, check, and get back to the water.

The captain says a word you don't know. Lights appear on the horizon you can't identify. A buoy sits off the bow and you can't remember which side to pass. Ahoy answers in seconds.

WHAT'S INSIDE • Ship Lights: identify vessels at night by their light pattern, shown from every angle as glowing schematic diagrams • Signal Flags & Marine Alphabet: all 36 flags and their meanings, Alpha to Zulu • Buoys: lateral, cardinal and other sea marks, with the shapes each mark can take • Day Shapes: cones, balls and diamonds, and what they tell you about a vessel • Beaufort Scale: real sea-state photos for every force from 0 to 12 • Clouds: read the sky with photo references and what each cloud means for your weather • Sound Signals: blast patterns for good and restricted visibility • Radio Help: ready-to-read VHF scripts for Mayday, hailing a vessel and radio checks • Dictionary: searchable sailing jargon, from abeam to windward

MADE FOR REAL TRIPS • Polish and English, following your device language • No ads, no account needed • IALA buoyage for your region

AHOY PRO • A one-time purchase unlocks full offline access, so every reference works with no signal at sea • Everything else stays free

FOR LEARNERS AND CREW Whether you're preparing for a recreational licence or joining a friend's boat as crew, Ahoy gives you the confidence to be useful on deck. It won't pretend to replace a course.

Ahoy is reference material for recreational sailing, not a navigation tool. Always verify against official, up-to-date sources.