Signal Library
Morse Code
Letters
- A · —
- B — · · ·
- C — · — ·
- D — · ·
- E ·
- F · · — ·
- G — — ·
- H · · · ·
- I · ·
- J · — — —
- K — · —
- L · — · ·
- M — —
- N — ·
- O — — —
- P · — — ·
- Q — — · —
- R · — ·
- S · · ·
- T —
- U · · —
- V · · · —
- W · — —
- X — · · —
- Y — · — —
- Z — — · ·
Numbers
- 1 · — — — —
- 2 · · — — —
- 3 · · · — —
- 4 · · · · —
- 5 · · · · ·
- 6 — · · · ·
- 7 — — · · ·
- 8 — — — · ·
- 9 — — — — ·
- 0 — — — — —
Whistle Patterns
Standard (agree with group)
- 1 blast: Where are you?
- 2 blasts: Come to me
- 3 blasts: Distress
Ground-to-Air Symbols
Large, high‑contrast symbols (strokes ≥ 6–10 m; 1–3 m wide) with a 2–5 m cleared “halo” around the symbol: V (assistance), X (medical), → (direction), Y/N (yes/no), SOS, F/W (food/water). Place in open areas near handrails.
Rule of Three: Three fires, three flashes, three blasts—repeat with gaps.