Signal Deck: ICS Flag Trainer

Learn NATO's signal alphabet

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

SignalDeck is the essential training companion for mariners, naval cadets, offshore sailors, and maritime enthusiasts who want to master the International Code of Signals (ICS) flag system — the visual language of the sea. Study the Full ICS Flag Set Browse all 36 ICS flags — the complete 26-letter alphabet (Alpha through Zulu) plus 10 numeral pennants (0 through 9) — presented as beautifully rendered flashcards. Each card shows the flag's name, NATO phonetic pronunciation, and its official maritime meaning. Swipe through at your own pace, filter by letters or numerals, or shuffle the deck to keep every session fresh. Three Drill Modes to Test Your Knowledge Visual ID: A flag appears on screen. Can you name it before time runs out? Tap the correct NATO name from four options and build your streak as the pace intensifies. Flag Bag: The challenge flips — you're given a NATO letter or name and must pick the correct flag from four choices. Perfect for cementing the visual recognition you've built in study mode. Flag IQ: A memory match game with a nautical twist. Flip face-down cards on a grid to pair each flag image with its NATO letter or official ICS meaning. Choose Easy (4×4, letter cards), Medium (4×5, meaning cards), or Hard (6×6, mixed) — and earn your rating from Bridge Apprentice to Master Chief Signalman based on how few mismatches you make. Built for Serious Learners Animated flags rendered with authentic nautical proportions and a sea-breeze waving effect Streak tracking with escalating visual feedback as your streak climbs "Needs Practice" summary after every drill — instantly see which flags to revisit Fleet Readiness Heatmap in your drill log — colour-coded badges show your mastery level for every flag at a glance Drill log that records every session so you can track progress over time Timed pressure in Visual ID and Flag Bag mirrors the urgency of real-world flag communication A Living Reference at Sea and Ashore Whether you're preparing for a maritime exam, brushing up before an offshore passage, training cadets, or simply fascinated by the tradition of visual signaling, SignalDeck gives you a focused, distraction-free environment to drill the flags that matter. Free to Start — Go Premium for Unlimited Access New users get free drill sessions to explore the app. Watch a short ad to unlock another round, or upgrade to Premium for unlimited drills, no ads, and full access to every mode and difficulty tier. The sea doesn't wait. Neither should your training.

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v1.0.57 --- Bug Fixes - Tablet (landscape) — Tutorial overlay alignment: Fixed an issue where the "How to navigate" and "Shuffle Mode" tutorial overlays appeared shifted to the right on tablets in landscape orientation. The overlay now correctly highlights the card and positions all annotations, labels, and buttons over the actual card area.

Version 1.0.57

The developer, Ernest Jessop, 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 Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Identifiers

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer indicated that this app supports the following accessibility features. Learn More

  • Supported Features

    • Dark Interface

    • Differentiate Without Color Alone

    • Sufficient Contrast

    • Reduced Motion

Information

Seller
  • Ernest Jessop
Size
  • 56.6 MB
Category
  • Education
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPad
    Requires iPadOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
Languages
  • English
Age Rating
13+
In-App Purchases
Yes
Copyright
  • © 2025 Ernest Jessop
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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