Ahoy: Sailing Pocket Guide
Flags, lights, buoys, signals
Free · Designed for iPad. Not verified for macOS.
Every flag, light, buoy, cloud and signal, one glance away. Fully offline, no account, free.
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, entirely offline.
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
• Works fully offline, because there's no internet at sea
• Polish and English, following your device language
• No account, no ads, no tracking
• IALA buoyage for your region
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New Chart Symbols module: learn to read a nautical chart, from dangers and depths to buoys, beacons and lights. Plus new Buoys and Flags training decks to test yourself.
Ahoy now runs on iPad, with a landscape layout built for the bigger screen, and a smoother first-run walkthrough.
The developer, Krzysztof Przekwas, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Krzysztof Przekwas
- Size
- 95.9 MB
- Category
- Reference
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Krzysztof Przekwas