Flashing Light: Morse Trainer

USCG signal lamp practice

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

Walk into your U.S. Coast Guard flashing-light check able to read the lamp, send clean timing, and call ICS code groups without hesitation. Train receive, transmit, and ICS signal work at the real 4-8 WPM exam range. This is a chartroom instrument, not a gamified Morse toy: a single high-contrast lamp on a dark, low-glare screen, with instrument-grade typography. It trains the three things a real check demands, and measures readiness by actual accuracy, not streaks or confetti. Purpose-built for USCG deck-license candidates, maritime academy cadets, and renewing or upgrading officers. CW and signaling hobbyists who want disciplined visual Morse practice will feel at home too. WHAT IT TRAINS - Receive: decode characters, code groups, and signals flashed by the on-screen lamp, then answer for immediate scoring. - Transmit: send Morse back with a press-and-hold lamp key. A timing strip grades every dot, dash, and gap to the millisecond against tolerance, with optional haptics. - ICS: decode the International Code of Signals group, then choose its PUB 102 meaning - both graded. A REAL COURSE, NOT FLASHCARDS - Two progressive tracks: Characters (maritime-tuned Koch order) and Signals & phrases (single-letter signals, prosigns, SOS, ICS groups). - Leitner 5-box spaced repetition schedules your weak items and shifts you from multiple-choice to recall as items mature. - Farnsworth spacing tightens from wide to exam cadence automatically. - A quick Daily session and a tap-to-preview Reference grid of every letter, number, and code. HONEST READINESS, NO CONFETTI - Mock Exam runs a realistic USCG-style sequence: single and grouped receive, SOS and single-letter signals, timed items, transmit prompts, and ICS decode/meaning. - A Readiness estimate across Receive, Transmit, and ICS - with replay dependence tracked as its own signal. - Ranked weakest-symbol and confusion-pair tables, accuracy by speed, and recent-session history. DESIGNED FOR THE EYES - First-launch photosensitivity warning; honors Reduce Motion. - Symbolic-only mode replaces flashes with an on-screen dot/dash indicator. - Adjustable lamp brightness, optional haptics, high-contrast controls, large touch targets, VoiceOver throughout. FREE TO START - The complete Learn course (both tracks, spaced repetition, Farnsworth spacing, Daily session, Reference grid). - Receive drills at 4 WPM, the full progress dashboard, and review tables. ONE-TIME FULL ACCESS ($9.99, lifetime - not a subscription) unlocks: - Transmit drills with per-pulse millisecond timing. - ICS code-group decode plus PUB 102 meaning grading. - The full Mock Exam. - Receive drills at every speed, 5-8 WPM. - Progress export to JSON. Works fully offline and on-device - no account required, no tracking, and your progress stays on your device. Built on public-domain maritime standards: Morse, the International Code of Signals, and PUB 102. From Osprey Applications LLC, maker of Coast Guard Exams and Mariner Studio.

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• Contact the developer from Settings — report a bug, request a feature, or just say hello • Rate Flashing Light and find our other apps from Settings • Reliability improvements to how training content loads • Your progress and settings are preserved

Version 1.2

The developer, Osprey Applications LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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Accessibility

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Information

Seller
Osprey Applications LLC
Size
25.8 MB
Category
Education
Compatibility
Requires iOS 18.4 or later.
  • iPhone
    Requires iOS 18.4 or later.
  • iPad
    Requires iPadOS 18.4 or later.
  • Mac
    Requires macOS 15.4 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 2.4 or later.
Languages
English
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2026 Osprey Applications LLC
  • 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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