// CHAPTER 05
Chapter 5 — Mots courts
The unmissable short words: SOS, OK, CQ. You learn the most famous signals in the world.
The 5 signs of this chapter
5 signs to learn in this chapter. Click a tile for the dedicated reference page.
What you learn
Chapter 5 targets the most iconic Morse words: SOS (···−−−···), CQ (general call), OK (acknowledgment). It's also when you send your first complete messages and where the "First word" and "SOS" badges become reachable.
Mission Morse lessons
Each chapter has two lessons: "listening" (8 audio questions) and "rhythm tap" (6 tapping questions). Lessons chain in Mission Morse once you sign up.