NAVISIGN: Signal Flags & Buoys

Hugo Uberger OÜ

Contains adsIn-app purchases

About this app

NAVISIGN — Professional Maritime Reference

Your complete offline guide to maritime signals, navigation marks and
communication. Built for sailors, yacht crews, navigators and maritime
students worldwide.

No internet required. Everything works offline — at sea, in remote
anchorages, or anywhere connectivity is limited.

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📌 WHAT'S INSIDE
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🚩 SIGNAL FLAGS — ICS (International Code of Signals)
All 26 alphabet flags (A–Z) with official meanings, visual patterns
and phonetic letter codes. Instantly identify any flag encountered
at sea.

⚓ BUOY & MARK GUIDE — IALA System
8 buoy types fully explained with action guidance and light
characteristics:
• Red (Port) and Green (Starboard) lateral marks
• Yellow Special mark
• Isolated Danger mark
• Safe Water mark
• North, South, East and West Cardinal marks

📡 MARITIME MESSAGES
21 standard maritime signals organised by category:
• Distress — SOS, Man Overboard, Sinking, Fire on board
• Medical — Doctor required, Medical assistance
• Navigation — Pilot required, Vessel stopped, Diver down
• Notice & Greeting signals

🔊 MORSE CODE
Complete reference: letters, digits, punctuation and 16 essential
maritime signals — SOS, MAYDAY, PAN-PAN, CQD and more.

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🌐 8 LANGUAGES
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Full content translated into:
English · Русский · Français · Deutsch
Español · Português · العربية · 中文

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⭐ PREMIUM — ONE-TIME PAYMENT
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No subscription. No auto-renewal. Pay once — own forever.

Unlocks:
✓ All 26 signal flags + 10 numeric pennants
✓ Complete buoy reference (all 8 IALA types)
✓ All 21 maritime messages
✓ All 16 Morse code maritime signals
✓ Ad-free experience
✓ All future modules included at no extra cost

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🔮 COMING SOON
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• AI Flag Recognition via camera
• Semaphore Alphabet
• Ship Navigation Lights
• VHF Radio channel guide

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Whether you're a seasoned skipper or learning the ropes — NAVISIGN
gives you instant access to the maritime knowledge you need,
wherever you sail.

What’s new

Semaphore Alphabet A–Z — learn maritime flag semaphore! New Message mode: type a word and watch each letter animated with a flag figure. Improved colors and text readability throughout the app.