Distress and safety frequencies
VHF (Marine band)
| Channel | MHz | Use |
|---|---|---|
| 16 | 156.800 | Distress, urgency, safety, calling. Listening watch required. |
| 70 | 156.525 | DSC distress, urgency, safety, calling. Voice not permitted. |
| 13 | 156.650 | Bridge-to-bridge / navigation safety. |
| 06 | 156.300 | Intership safety, SAR. |
| 67 | 156.375 | Intership safety, SAR. |
MF / HF
- 2182 kHz — MF radiotelephony distress, urgency, safety.
- 2187.5 kHz — MF DSC distress.
- 4207.5 / 6312 / 8414.5 / 12577 / 16804.5 kHz — HF DSC distress.
- 4125 / 6215 / 8291 / 12290 / 16420 kHz — HF radiotelephony distress and safety.
- 490 / 518 / 4209.5 kHz — NAVTEX.
GMDSS
- 406 MHz — Cospas-Sarsat EPIRB.
- 121.5 MHz — Homing beacon (AM).
- 9200–9500 MHz — SART (X-band radar).
- Inmarsat-C — A1/A2/A3 DSA areas where applicable.